Just a thought, but if you were to plug the ring finger, and drill a new hole next to the existing hole, wouldn't that throw off the individual finger spans? Unless you have identical lengths, this could cause an uncomfortable fit, and create a whole new set of problems.
Also, you would not be the only one using a TR as a spare ball, i used mine until i picked up the pearl crisis
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When you go to bowl, remember.....Always bring extra purses, you never know when that pesky five pin is gonna dodge your ball.