ok here we go:
i have two of the same exact movement, caliber and make, waltham 1907 6/0 size. iam having the same issue with both of them. i took them apart cleaned and oiled them. mainspring is good in both. when i put the pallet fork in and wind the watch, iam not getting the snapping back and forth action from the pallet. if i operate it manually it spins the escape wheel just fine. when i take it out the train unwinds and its very smooth and i even get the little wind back at the end so i knowwww its not a mainspring problem, and i swapped pallets and pallet cocks in every combo possible and iam getting the same result in both movements. The pallet jewels are fine no chips or loose jewels. I really dont get it, i have never had this issue.
as i said if i operate the pallet lever with tweezers and move them back and forth the escape wheel turns, but the pallet will not snap by itself. what in the world could the issue be. The fact that its happening in both movements using different but same parts makes it even more of a mystery. any ideas????