Equipment
Charl Schwartzel’s drilled-out Miura irons: A builder’s perspective
We see plenty of cavity back irons on the PGA Tour. Most of these irons have been strategically designed to position weight and center of gravity to maximize performance. Spotted this week at the AT&T Pebble Beach Pro-Am: a nonconventional set of “cavity backs” in the form of Charl Schwartzel’s drilled-out Miura MB-001 blade irons.
As first reported by Golf.com’s Andrew Tursky, Charl, an equipment free-agent, bought the irons online, and after tinkering with them (obviously, Charl is a true gear nut), he felt the irons were just a bit too heavy at D6 swing weight and wanted to bring them down to around D3. These number will seem quite arbitrary to some, so to help explain swing weight, we have a short video below
Now, the question comes down to why would he drill out the irons instead of just having the clubs built to his desired spec?
In the case of Miura irons, a company founded in Japan. The iron head weights are heavier than others on the market because Japan spec irons are generally built to shorter lengths than their North American counterparts. The clubheads are noticeably heavier in the shorter irons and wedges (see chart below), which is why we see more holes in the pitching wedge vs. the longer irons.
Since the MB-001’s are a solid muscle design with no badges or weight ports in the head, there is no other way to remove the mass needed to hit a lighter swing weight for Charl—unless Miura was to produce a set heads at a lighter weights by grinding off mass during the final production steps before final finishing.
Head weight specs 3-PW starting at 245g at the 3-iron.
As a result, when built with heavier tour weight shafts (anything 110g or above) and at a standard North American length (37″ – 7 iron, or longer), the clubs will end up being heavier than what would be considered standard swing weight (usually between D1-D4). Let me please point out that in the golf club manufacturing world there are very few standard practices or measurements beyond the USGA ruler and swing weight scale. Although the phrase “standard clubs” is still common nomenclature, it applies very little to the custom club building world.
Beyond adding mass to the grip end of the club to counteract the heavier weight of the heads, a practice known as counterbalancing, the only other option is to drill mass out of the clubhead (see full video above for further explanation). Charl reportedly did the drilling himself when fine-tuning the clubs and after a few holes got them right where he likes them.
Based on the thickness of the iron muscle and the amount of mass removed from each head (roughly six grams), these holes have no effect on the performance of the irons (but have probably killed any potential resale value on the open market—bearing in mind that last part is tongue in cheek). If Charl wins another major with these, who knows what they would be worth.
Other examples
This process of drilling out mass has also been referred to as “porting,” and club builders have been doing it for a long time. In the case of wedges, porting not only helps reduce clubhead weight, but can also help (in a very, very small way) remove mass from lower in the head to raise the CG. It’s the exact reason Callaway introduced this design feature in the original PM Grind and continues with the design philosophy today in the JAWS MD5.
With Bryson’s wedges being more than 1″ over standard length, weight had to be removed from the head.
We don’t recommend you start drilling holes in your irons and wedges just yet and suggest seeing a professional club builder to help you sort out your specs and get you dialed in. For more pictures of the clubs Charl Schwartzel is using this week, head to the GolfWRX forum: Charl Schwartzel – WITB 2020 AT&T Pebble Beach
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- Richy Werenski what’s in the bag accurate as of the CJ Cup Houston Open.
Driver: Titleist TSR3 (10 degrees, D1 SureFit setting)
Shaft: Mitsubishi Diamana PD 60 TX
3-wood: Titleist TSR2 (15 degrees, A1 SureFit setting)
Shaft: Fujikura Ventus Red 8 X
Hybrid: Titleist TSR3 (19 degrees, D1 SureFit setting)
Shaft: Mitsubishi Tensei CK Pro White Hybrid 90 TX
Irons: Titleist T100 (4-9)
Shafts: Nippon N.S. Pro Modus3 Tour 105 S
Wedges: Titleist Vokey Design SM9 (46-10F, 50-12F), Titleist Vokey Design WedgeWorks Proto (54-M, 58-L @60)
Shafts: True Temper Dynamic Gold Tour Issue X100 Onyx (46-50), True Temper Dynamic Gold Tour Issue S400 Onyx (54-60)
Putter: Scotty Cameron prototype
Ball: Titleist Pro V1x Left Dash
Grips: Golf Pride ZGrip Cord
Check out more in-hand photos of Richy Werenski’s clubs in the forums.
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Equipment
Adam Scott testing green “Masters Use Only” putter + 6 interesting equipment photos from the 2024 CJ Cup Byron Nelson
Welcome to the 2024 CJ Cup Byron Nelson event at TPC Craig Ranch in McKinney, Texas, which, for your geographical reference, is about 25 minutes from Dallas.
In early-week equipment news, we saw some interesting putter testing from Adam Scott, a Maxfli golf ball signing on the PGA Tour, a 16-year-old’s WITB, a PGA Tour player using another PGA Tour player’s backup putter, and Jordan Spieth weighed in on why he recently switched out just his 7-iron (and then made a hole-in-one with it).
With so much to report and so little time to waste on the intro, let’s get right into this week’s equipment rundown from the CJ Cup Byron Nelson.
See all of our photo galleries from the week here
Adam Scott’s new L.A.B. putters
Before we get into a couple of the new prototypes Scott has been testing, above is a photo of the L.A.B. Golf Mezz.1 Max prototype putter that he’s been using, and will likely continue to use this week in Texas.
That being said, following the Masters, Scott was looking to try a couple putters with a slightly lighter weight to help with his feel on fast greens.
One of the new prototypes we spotted on Tuesday was a L.A.B. Golf DF3 “Proto 2.1”, custom-built with Scott’s preferred blue colorway, and an Australia-inspired Kangaroo laser engraving…
We also spotted him with a green-colored “For Masters Use Only” Mezz.1 Max prototype…
While it’s unlikely Scott will make a switch this week, it’s certainly something to keep an eye on going forward, especially on courses with faster greens.
We also got a peek into Scott’s full WITB this week, which consists of a super-mixed set of Srixon irons, including a ZX Utility 3-iron, a ZX-5 MkII 4-iron, ZX-7 MkII mid-irons (5-7) and Z Forged II short irons (8-9).
See Scott’s full WITB from the CJ Cup here
An update on Daniel Berger’s Odyssey Jailbird
Last week in New Orleans, we highlighted Daniel Berger’s Ai-One Jailbird Mini putter because of its unique sightlines.
Well, we have an update.
According to Callaway Tour Manager Joe Toulon, who spoke with GolfWRX.com this week, Berger’s Jailbird Mini is actually from fellow Tour player Tom Kim’s stash. Kim is a prolific putter tester, and the exact putter Berger is currently using was actually originally made for and tested by Kim. The putter didn’t make it into Kim’s starting lineup, however, so he gave the putter back to Odyssey, and it eventually made it’s way onto Berger’s gamer roster.
Jordan Spieth’s new 7-iron
As the story goes, Jordan Spieth changed out his Titleist T100 7-iron on Wednesday before the 2024 Valero Texas Open, and then on Thursday, he used the 7-iron to make a hole-in-one from 199 yards on the 16th hole.
Good timing on that switch, Jordan.
On Tuesday at the 2024 CJ Cup Byron Nelson, GoflWRX.com caught up with Spieth to get the full story on why he switched just the 7-iron.
Our full story is over on PGATOUR.com’s Equipment Report, but here’s a snippet of what Spieth had to say:
“I hit my 7-iron a lot, especially on my own. The spin rates, relative to my 6-iron and my 8-iron, were lower, so it was going too far. I was trying to figure out why, if it was something in the makeup of the iron. I got the lies and the lofts checked, and everything was fine. So finally I was like, ‘Can I just get a new one and see if it fixes it?’
“Maybe there was one other time throughout my career where I changed just one iron, so it’s very unusual. I think it’s just because the grooves were worn down from hitting it too much.”
Ben Griffin signs with Maxfli to play the golf ball
At the beginning of the year, LPGA Tour star Lexi Thompson signed a deal with Maxfli to play the company’s golf ball, and now, Griffin has officially joined team Maxfli, as well, thus expanding the company’s Tour presence.
GolfWRX.com caught up with Griffin on Wednesday in Texas for a video interview about his new golf ball of choice, and how he marks it…
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A 16-year-old is playing on the PGA Tour this week, using a 2-iron!
Amateur golfer Kris Kim, at just 16 years of age, is making his PGA Tour debut this week after receiving a sponsors exemption into the event. In 2023, Kim won both the R&A Boys’ Amateur Championship and the European Boys’ International Championship.
On Tuesday in Texas, we got a look into Kim’s bag, which revealed that he’s currently playing a TaylorMade P-770 2-iron, and a bag full of TaylorMade clubs.
Check out Kim’s full WITB here
A smart golf ball stamping
I’m not going to sit here and pretend to be a big math guy, because I’m not. However, I do recognize David Nyfjall’s purple ball marking as a square root symbol.
While I don’t know the particular significance of the square root symbol for Nyfjall, I do know you have to be fairly intelligent to even consider using a marking like that. Pretty cool stuff from the Northwestern alum, and 2023 Byron Nelson Award winner.
And, with that, we say goodbye to Texas and TPC Craig Ranch. We’ll see you next week at the Wells Fargo Championship in Charlotte for more insider equipment news and storylines.
For now, don’t forget to check out all of our photos from the 2024 CJ Cup Byron Nelson
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- Wesley Bryan what’s in the bag accurate as of the CJ Cup Byron Nelson.
Driver: Callaway Paradym Ai Smoke Triple Diamond Max (9 degrees @10)
Shaft: Mitsubishi Diamana GT 50 TX
3-wood: TaylorMade Stealth Plus (15 degrees)
Shaft: Mitsubishi Diamana GT 60 X
Hybrid: TaylorMade Stealth 2 Plus Rescue (19.5 degrees)
Shaft: Fujikura Ventus HB Blue 8 X
Irons: Titleist T200 (4), Takomo 101U (4), Takomo 101T (5), Takomo 301 CB (6-9)
Shafts: True Temper Dynamic Gold Tour Issue X100
Wedges: Titleist Vokey Design SM10 (46-10F, 52-08F, 56-14F), Titleist Vokey Design WedgeWorks Proto (58-A)
Shafts: True Temper Dynamic Gold Tour Issue S400
Putter: L.A.B. Golf DF3
Grips: SuperStroke, Golf Pride Tour Velvet
Ball: Titleist Pro V1x
More photos of Wesley Bryan’s WITB in the forums.
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Dave Portnoy places monstrous outright bet for the 2024 Masters
John Daly stuns fans into silence with brutal opening tee shot on PGA Tour Champions
Justin Thomas on the equipment choice of Scottie Scheffler that he thinks is ‘weird’
Things got heated at the Houston Open between Tony Finau and Alejandro Tosti. Here’s why
Tiger Woods arrives at 2024 Masters equipped with a putter that may surprise you
‘Absolutely crazy’ – Major champ lays into Patrick Cantlay over his decision on final hole of RBC Heritage
Report: Tiger Woods has ‘eliminated sex’ in preparation for the 2024 Masters
Two star names reportedly blanked Jon Rahm all week at the Masters
2-time major champ announces shock retirement from the sport at age of 33
Report: LIV Golf identifies latest star name they hope to sign to breakaway tour
Richy Werenski WITB 2024 (May)
Richy Werenski what’s in the bag accurate as of the CJ Cup Houston Open. Driver: Titleist TSR3 (10 degrees, D1...
Wesley Bryan WITB 2024 (May)
Wesley Bryan what’s in the bag accurate as of the CJ Cup Byron Nelson. Driver: Callaway Paradym Ai Smoke Triple...
Adam Scott WITB 2024 (May)
Adam Scott what’s in the bag accurate as of the 2024 CJ Cup Byron Nelson. Driver: TaylorMade Qi10 (10.5 degrees)...
Pierceson Coody WITB 2024 (April)
Driver: TaylorMade Qi 10 (9 degrees) Shaft: Mitsubishi Tensei 1K White 70 TX 3-wood: TaylorMade Qi 10 Tour (15 degrees)...
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craig adams
Mar 12, 2020 at 12:42 am
Charles golf game has holes in it. He’s out of the top 200? A golfer as talented as he is shouldn’t have to tinker with clubs. Manufacturers should be throwing their clubs at him. Did his game go sour since moving to PXG? Why do golfers change a winning combination? Look at Westwood and Jiminez; been playing with Pings all their career.
Eldrick
Feb 20, 2020 at 3:38 am
Looks like his Gapr low is a glued non adjustable one.
Nack Jicklaus
Feb 12, 2020 at 1:02 am
He should have just drilled all the way through the faces like the old “Hammer” driver. Boom!!!!!!!!!!
Ima Fitter
Feb 10, 2020 at 5:02 pm
Love it! You don’t need to spend a ton of money on a new set of irons. As long as they are forged and you like the appearance, pre-owned irons can be fit to your swing. Change the loft & lie, change the shaft, change the grips…any qualified club builder can make them work for you.
Benny
Feb 8, 2020 at 8:02 pm
Great catch Wrx and article. Charl left PXG a while ago. But truly suprised he couldn’t get a set directly and have them custom grinded. Anyways great details and love the comments fellas.
bob stelben
Feb 8, 2020 at 3:01 am
Good video on swing weights. Can you explain tipping of the shaft and the reasons or advantages/disadvantages?
Steve
Feb 7, 2020 at 3:23 pm
I thought Schwartzel was a PXG guy? Guess I am mixing up who Parson’s friends are. And I agree….drilling holes in Miura irons is like adding your own touch up paint to the Mona Lisa. To each his own, I guess.
Funkaholic
Feb 7, 2020 at 4:55 pm
I doubt a pro is bagging those Miuras for status, he is going to play the grooves off of those babies, appearance is for weekend hackers.
Donn Rutkoff
Feb 6, 2020 at 3:17 pm
Palmer probably drilled out hundreds of clubs. Tinkering was common. To suit your own swing.
Fergie
Feb 6, 2020 at 12:33 pm
Drilling Miuras like that is, well, blasphemy. He should just get it over with and get CB’s.
Funkaholic
Feb 7, 2020 at 4:53 pm
CB’s are not the same idea at all, he is reducing swing weight, a CB redistributes weigh to lower in the head making raising MOI and them easier to launch.
Mike Cleland
Feb 6, 2020 at 10:32 am
I grew up playing D5 S/W clubs with standard lengths. Does any manufacturers make heavy headed clubs or do they just shove weight down the shaft & change the center of gravity. All my clubs are covered with lead tape. Any suggestions?
PS: I really enjoy your blogs
jgpl001
Feb 6, 2020 at 3:50 am
Nasty workmanship on a quality blade
He appears to be missing the drilled effect of hs old pig’s……
Dennis
Feb 6, 2020 at 1:28 am
Do all the pros go for swingweight instead of MOI-Matching?
Gurn
Feb 6, 2020 at 12:19 am
Those Miuras need that treatment like a hole in the head
bill bourne
Feb 5, 2020 at 8:01 pm
Does drilling out the backs affect the overall thickness spec?
JP
Feb 6, 2020 at 8:32 am
Huh? Overall thickness spec? What is that?
Tim Armington
Feb 7, 2020 at 7:54 am
You dont know what a thickness spec is??? Wow.
Funkaholic
Feb 7, 2020 at 4:56 pm
Ha! This guy doesn’t know what thickness spec is!
maroon
Feb 8, 2020 at 4:32 am
I know but it has nothing to do with golf 😉