After discovering a broken belt on my cabrio dryer, I discovered the idler pully had a flat spot on it so since i was in there i was going to give it a good cleaning when I discovered the rstrnr-blt(part# 8578538) had melted off the motor shaft pulley. My question is how would i go about putting the new part on. It seems to go behind the belt pulley on the motor but have no idea on how to get it there. Any help would be greatly appreciated.