Was baling hay a couple weeks ago when I mysteriously sheared a pin on the flywheel. I thought at the time it was kind of odd, rarely shear any and it wasn't damp or crazy heavy hay. Put a pin in and baled another 5-10 bales and did it again. I put another in and began rolling it over by hand at the flywheel when it went bang! I believe the plunger is hitting the safety stops. Thought maybe a chain skipped somewhere and was out of time. Checked all the timing marks (plunger,fingers, knotters,) all good. I backed it in the barn and got the round baler out and finished up. Haven't dug into it any farther yet. Anyone got an idea on where to start?