You probably need to lubricate the locking mechanism on the rotater assembly. It's not easy to get to, do a search on this site, there are instruction on how to remove, repair and re-install the assembly. Just for your info and others, the locking and unlocking mechanisms use the rotating mass to engage a pair of overcenter hooks to hold the assembly in place. The last two teeth on the gear sector have been modified to allow the mass to rotate once full travel of the sector has been made, and also to allow the sector to begin rotation before the mass is engaged. You have to see it to visualize. Real clever engineering.


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