So I got to the bottom of the issue I was having. When I would set up the SW scale with the club without the grip on, I moved the shaft to touch the back of the scale. It finally hit me when I noticed everything was off by ~1.5 SW points which is pretty darn close to the thickness of the grip butt of 5mm (using the 1/2" = 3 swing weight point rule of thumb). So I had to take some weight out of two of the clubs I built. When I did, there was going to be no way to get the tungsten powder back up in the shaft with any degree of precision. (didn't want to remove grips and the cork and all that jazz). I was trying to get the MOI perfect.
To perfectly MOI match a set you'll want to thank PineWood Derby competitors. Tungsten Putty. It's great because you can place the putty on the club, roughly where it will sit in the hosel/shaft, and then test MOI. Then you can get it up in the shaft (pushing it to the sides with a scratch awl) then retest.
Note: Ferrule not finished in this shot!
It is sticky enough to stick to the sides of the inside of the shaft if you don't have enough to have a full slug in there, and hopefully won't move around. What I like about it is that I can have the grip on (cork down in the shaft a reasonable distance) and push in enough Tungsten Putty to get the MOI perfect. The risk I might have had would have been if it things weren't all snug up in there when I put everything together, Or if the cork was too low if I needed to upweight a club. I got lucky this time, and everything fit okay.
To redo the 6-iron that was D4.5, I pulled the head, poured out the tungsten powder, and put back in the tungsten putty.
This is super important because the 6-iron at D3 was what Joe Kwok fit me for, and I was building the MOI matched set off of that club.
Bang ON D3.
I think if I had to get perfect weights all over again, here's the process I would follow to SW or MOI match the set:
1. Dry fit everything with the hosel on, sans grip, but with the tape you're going to use on the shaft (grip sticks nice to it).
2. Put club in SW or MOI scale and use the tungsten putty like silly putty to get the weighting absolutely perfect.
4. Roll the tungsten into a cylinder that will fit perfectly up the shaft.
5. Measure the length of the tungsten you just estimated in #4, and add a little extra
6. Push a cork down to where you can still get the tungsten and a touch extra in.
7. Put the grip on
9. Retest your weighting and adjust as necessary (account for 0.2 g or so for epoxy)
10. Glue it up and Test again...adjust if necessary
Will warm up and hit each club this weekend, then repost the original spreadsheet with the data all filled in. MOI's were +/- 1 or 2 MOI unites across irons 4-GW, and same for SW and LW which have a slightly higher MOI. SW are ~0.5 SW from club to 4-GW
Edited by Strolf, 13 January 2018 - 01:42 AM.