For getting a copy of my drill sheet, I probably could do that, even though I know some aspects of my grip. I think my driller would charge someone who asked for that though, only because of the fact that you can getting drilling done by online stores now.
I get thumb slugs with the vent holes in them but I don't think they really work since I normally have a "suction" sound when I put my thumb in and take it out. More so when it's first drilled though.
Playbowl, I'm basing the accuracy of my span off the test that says inserting your thumb and laying your fingers across the holes with the hand relaxed(not scruched or stretched) should have the midway point between the first two joints of the fingers in line with the leading edge of the hole(finger grip in my case). It seems right to me, but that depends on if I'm really doing the test right. If anything I thought I could afford to go shorter. When my driller re-fit me probably around 6 months ago, he did have me at 4 1/4 for both fingers, but when I went to insert my thumb the ring finger wanted to "lift" up in the hole like it wanted to come out so we shortened it to 4 1/8. My driller put me at 1/8 forward when we did this, it was going to be 1/16 forward before we shortened the ring.
From the sounds of things, you're saying every aspect of the grip is interrelated. My driller seems to agree with that quite a bit, in the sense that he tries to get the finger pitches and thumb pitch working together. He hates forward pitch in the fingers especially with forward pitch in the thumb. The idea of finger pitches is to have the pads of your fingers in good contact with the front of the holes isn't it? I agree about needing to know how to adjust thumb snugness, I'm just not sure how snug is considered correct. I don't think you should have to work to get your thumb in but I don't think you should be able to slide the thumb in and out without feeling anything either(if that makes sense).
For the free swing and relaxed grip on the ball, I don't think my driller will be hearing that. He does say the shoulder should be free. We had a brief conversation about the ball slipping from my thumb and he said it's because I'm not under the ball. But neither is Michael Fagan and probably other successful bowlers. I mentioned that I freed up my swing earlier in the year and he seemed to advise against just letting the ball fall into the swing like I was doing. He also says you have to apply pressure to the ball to keep it on your hand but there have been a couple of times where he told me to relax the hand "from the apex of the swing." His exact words. I had recently come across the idea of setting the thumb, and that seems to help with the thumb slipping. For that to work though, I think I need only a little bit of bevel.
Just curious, what's your view on the Bevel Sander and its use? My driller uses it an awful lot and it seems like too much, both on the inside of the hole and for beveling. I think it'd be much easier to drill more cuts and just do a few hits with the sander.
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