Case back torque

[Pinion Minion]

Today I learned that a caseback can be put on too tight....

Really tightening a Clean GMT:




And after loosening the back maybe 5 degrees??

 

[WatchSmith.US]

Another surprise courtesy of Clean GMT. I’ve not seen this but I’ll make a note of it. Does the rotor spin freely when you have it tightened?

 

[Pinion Minion]

Hard to say due to my superior lubrication technique... But let me see- that's a good point.

 

[Pinion Minion]

Sorry @WatchSmith.US , I meant to follow up on this.

Testing again, I do think the rotor may be impinged when the case is overly tightened.