Dear Watchmakers
I am writing my first post, because I need some advice and can’t find a solution myself.
I am working on an old ETA 2873. I completely disassembled it, cleaned and checked all the parts and finally reassembled everything together.
Problem: I can’t set the time manually by turning the crown. The crown in the time setting position is stuck. Everything else works fine.
My findings: The cannon pinion on this type of movement is held in place between two spokes (see attached photos). I guess there needs to be the right amount of friction between the two parts. Enough friction to hold the cannon pinion in place to rotate the hands by the movement itself, but not too much friction in order to be able to turn the crown and set the time manually. Right?
I think there is too much friction now. The two parts after decades somehow stick together. I tried to rotate them against each other, but I see damage coming, when I try to overdo it…
What can I do to get this running as it should?
Best wishes