I have old racquets that I have restrung multiple times (>75) and they still felt fresh. Of course I keep my racquets' tension near the low end of the recommended range. If the hoop is beginning to flex a lot, I attribute it more to high tension and the ball being smashed hard against the string bed. If the shaft is beginning to flex, that is due to the hitter hitting the ball hard.
Last edited by esgee48; 10-25-2010 at 04:35 PM.
Reason: fix typos (gotta learn to type)