the plastic gear at the end is split making it a little wider on the split half. as the drive spins it will get hung up at that revolution. i tried to loosen the bracket that holds the motor then it does not grip the gear good enough, too tight and it locks the drive shaft per the revolution. its time to replace it. anyone have a dead fz1 cd drive. i don't need a working laser. let me know I'll buy it from you .