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.
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.
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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Whats in the Bag
Daniel Berger WITB 2024 (April)
- Daniel Berger what’s in the bag accurate as of the Farmers Insurance Open. More photos from the event here.
Driver: Ping G430 LST (10.5 degrees)
Shaft: Fujikura Ventus Black 6 X
3-wood: TaylorMade Qi10 (15 degrees)
Shaft: Fujikura Ventus Black 7 X
6-wood: TaylorMade Qi10 Tour (21 degrees)
Shaft: Fujikura Ventus Black 8 X
Irons: TaylorMade P770 (3), TaylorMade Tour Preferred MC 2011 (4-PW)
Shafts: Project X Denali Blue 105 TX (3), Project X 6.5 (4-PW)
Wedges: Titleist Vokey Design SM9 (50-12F), Titleist Vokey Design SM10 (56-14F), Callaway Jaws Raw (60-08C)
Shafts: Project X 6.5 (50), True Temper Dynamic Gold Tour Issue S400 (56, 60)
Putter: Odyssey Ai-One Jailbird Mini DB
Grip: SuperStroke Zenergy PistolLock 1.0
Grips: Golf Pride Tour Wrap
Ball: Titleist Pro V1
Check out more in-hand photos of Daniel Berger’s clubs in the forums.
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Equipment
Heavy Artillery: A look at drivers in play at the Zurich Classic of New Orleans
What are the driver and shaft combinations of the best golfers in the world? For gearheads, it’s an endlessly interesting question — even if we can only ever aspire to play LS heads and 7 TX shafts.
At this week’s Zurich Classic of New Orleans, GolfWRX got in-hand looks at the driver setups of a wealth of players.
Check out some of the most interesting combos below, then head to the GolfWRX forums for the rest, as well as the rest of our galleries from New Orleans.
Rory McIlroy
Driver: TaylorMade Qi10 (9 degrees @8.25)
Shaft: Fujikura Ventus Black 6 X
Grip: Golf Pride MCC
Alex Fitzpatrick
Driver: Ping G430 LST (10.5 degrees)
Shaft: Fujikura Ventus Black 6 X
Grip: Golf Pride MCC
Daniel Berger
Driver: Ping G430 LST (10.5 degrees @9)
Shaft: Fujikura Ventus Black 6 X
Grip: Golf Pride Tour Wrap
Rasmus Hojgaard
Driver: Callaway Paradym Ai Smoke Triple Diamond (10.5 degrees)
Shaft: Mitsubishi Tensei 1K Blue 60 TX
Grip: Golf Pride MCC
Alejandro Tosti
Driver: Srixon ZX5 Mk II LS (9.5 degrees @10.5)
Shaft: Project X HZRDUS T1100 75 6.5
Grip: Golf Pride MCC Plus4
James Nicholas
Driver: Titleist TSR3 (8 degrees, A1 SureFit setting)
Shaft: Fujikura Ventus TR Blue 7 X
Grip: Golf Pride Tour Velvet
Kevin Streelman
Driver: Titleist TSR3 (10 degrees, D1 SureFit setting)
Shaft: Fujikura Ventus TR Black 6 X
Grip: Golf Pride Tour Velvet
Sang-moon Bae
Driver: Callaway Paradym Triple Diamond (9+ @8)
Shaft: Fujikura Ventus Blue 6 X
Grip: Golf Pride Tour Velvet
Russ Cochran
Driver: Callaway Paradym Ai Smoke (9 degrees)
Shaft: Graphite Design Tour AD TP 6 X
Grip: Golf pride MCC Align
MJ Daffue
Driver: Callaway Paradym Ai Smoke Max (10.5 degrees @9.5)
Shaft: Project X HZRDUS Smoke Green RDX 65 TX
Grip: Golf Pride ZGrip Cord Align
Check our more photos from the Zurich Classic here.
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Whats in the Bag
Rasmus Højgaard WITB 2024 (April)
- Rasmus Højgaard what’s in the bag accurate as of the Zurich Classic.
Driver: Callaway Ai Smoke Triple Diamond (10.5 degrees)
Shaft: Mitsubishi Tensei 1K Blue 60 TX
3-wood: Callaway Ai Smoke Triple Diamond Prototype (16.5 degrees)
Shaft: Mitsubishi Tensei 1K White 80 TX
Utility: Callaway Apex UW (21 degrees)
Shaft: Mitsubishi Tensei AV Raw White 85 TX
Irons: Callaway Apex Pro (3), Callaway X Forged (4-PW)
Shafts: KBS $-Taper 130
Wedges: Callaway Jaws Raw (52-10S, 56-10S, 60-06C)
Shafts: KBS Tour 130 X
Putter: Odyssey Ai One Milled Eight T DB
Grips: Golf Pride MCC
Check out more in-hand photos of Hojgaard in the forums.
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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 😉