Unless you are on staff of Turbo or Vise,work own or work at a pro shop,the cost just
does not make sense to the casual,two leagues per week bowler.Adding around $40.00 +
per ball doesn't make sense.You are dealing with a device that has to be fitted almost
perfect.With drilling and fitting a new hole each time to use for the individual sleeve,you
will never get it perfect. I have talked to Chris Schlemmer a few times about this topic,he is
not a big fan of the interchangeable thumb slugs.He said it is never going to be a precise
science,and to many variables are involved, for each grip to fit in the sleeve perfcet in each ball.
He has seen too many come out in the bowlers release,no matter how good the driller.
Did anyone watch the 2008 USBC Queens,Liz Johnson lost to Amy Stolz because the Vise It dropped
down in the ball during the telecast and had to switch balls,by the time she found the right ball,
it was to late.And how about the 2009 Weber Cup,Chris Barnes v Dominic Barrett .The grip came
out of Chris' ball during release.
http://www.youtube.com/watch?v=6sEJqOon6jY Also talking to Chris Schlemmer on this subject during a tournament,a bowler right in
front of us had the Vise It come out as she released the ball, how ironic.
So I'm not a big fan of the interchangeable thumb,but that's just my opinion.