That's what I was planning to do if I did decide to drill the spare ball for VISE IT inserts. Just use the biggest one or 2nd biggest one for the spare ball. I have 6-7 inserts but usually use the same 1-2. In the summer or if I bowl a lot...maybe I get up into the 2 biggest ones...in the winter/colder weather maybe it get down to my second smallest. Rarely ever use the smallest one.
I also thought maybe having a second set...would be helpful if one broke or something. But usually when the VISE ITs fail, it's the part in the ball, not the inserts...so spare inserts don't help much in that situation.
I don't know if that's possible or not. Usually they drill the insert, you try it, then they drill it a little more, then you try it, then they smooth it out and maybe round it out a bit. It would be a hard process to 100% duplicate.
Although...that WOULD be a cool marketing idea...to make VISE ITs that are drilled for a specific Pro Bowler that you could buy. You could find a bowler with a similar sized thumb and then when you need another one for a spare ball..."yeah, can I get one of the Jason Couches and one of the Brian Voss'?"
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