The words of Sawbones ring very resoundingly true. I am not old yet, nor have I reached the epitome of wisdom, BUT I do know that when I reach the day that I am not able to perform at a certain level, I too may stop. It's kind of like John Elway, who accomplished just about all a QB could, except win a Super Bowl Ring. Once he did, he retired so that he would go out on the top of his game, rather than risk having a dismal season to remember, and to be remembered by his fans. Your father may have been an accomplished bowler (and probably can still roll the rock with astounding skill), but he believes that he would have more dismal performances than memorable ones. Bowlers in your center probably remember his great games when he walks into the place. People may even buzz a few remarks like, "there's so-and-so, he used to roll 200+ games as natural as breathing", etc... That is a place he wishes to stay, rather than risk losing.
I also like joe's idea of asking him to go to the center while you practice. get him to bowl in practice with you as a way for him to show you some of his wisdom and experience. This MAY show him he STILL DOES have the old stuff, and you get to learn a few things from the old master. I believe that he will be honest with you and himself in that, if the talent and ability to perform, at his desired level, is still there, he will return. I am excited to see how it turns out for you card, sounds like you believe in his abilities, and the admiration of a son/daughter is unmatched in a parent's life. Keep us informed of your efforts and progress, and I will hope with all my heart that it turns out what is best for your dad.
Because of Him
Dave
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If You Are Not the Lead SAW, All You Get is SAWdust!!