@Rocket Scientist have you removed the helical gear off the shaft yet? I am curious if you think the nut was at 145 NM torque. Just pondering a bit as I remember it caused problems on Mark Copess's bike. Trying to figure out how the snap ring got hit by the gear. especially when there is a snap ring on the fourth gear side also that was not drove out of its groove. Something I think would have happened or the shaft moved forward like Marcs's did.