Pinbuster -- I have used and sold balls with up to 3/4 reverse in the fingers because of stiff finger joints. I do not see a noticeable decrease in revs, just a fit that doesn't hurt. But I haven't tried the reverse on a bowler that doesn't need it because of stiffness. If you decide to use that much reverse, keep in mind that you will need to adjust the span and/or the thumb pitch to keep from grabbing the ball during the delivery. -- JohnP