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When you say “locks up”, do you mean it runs a short time and stops,. or that you can get no action at all ?
No action at all.
Have you tried to move the pallet fork manually back and forth with a piece of pegwood, ( with a few winds of power on the mainspring) and at the same time, watched the lock/slide action on the escape wheel ?
When I put the pallet fork into the mix, there’s almost no action. It’s as if the pallet fork jewels won’t allow the escape wheel to unlock. What I can’t get past is the idea that three sets of pallet fork/escape wheels are doing the same thing.
Is the guard pin on the fork dragging on the movement plate
Best of luck,
I’ll check that.