MF 124 problems

Does an mf 124 need retiming after it snaps a shear bolt on the flywheel because mine broke 2 before i relised the plunger was hitting on a hay dog or stop on the bottom of the chamber. I moved the dog or stop out of the way and continued to bale another 150 bales and then the right side needle bent and the knotter chain snapped. Is there a video of how to re time a massey 124 for dummies. Cheers

MF 124 problems