Sorry, I didn't even know that this forum was here! Well, I had it happen once and replaced mine twice. The first time it just broke like yours did. The second one was replaced the year I sold it. Highpoint explained it right. Not using it may be the major cause. However, it may be accellerated by the motor mounts "settling" down a bit and making this piece of rubber more of a universal joint than a coupler! Speaking of Universal joints! Went through a few of them too!!
My electric $245.00 PTO clutch went KAPLOEY when the new owner was demoing it in my yard! These 935's just dont want to be sold!!!
2004 GMC 2500HD Reg Cab BOSS 9.2 V-Plow
2013 eXmark LazerZ X-Series 60" 34hp EFI (RED) Kohler
2006 Hustler SuperZ 28EFI 60" Power Chute Design OCDC SOLD!
1996 48" SCAG Belt WB 14hp Kawasaki Classic Deck
Echo 2 strokes PB-755 & SRM 280
Eastman WM20H 20" Commercial Push mower (NEW for 2013)
Commercial Lawnboy trim mower 3-FOR SALE!http://www.lawnsite.com/showthread.php?t=424203
Solo since 1980