Caliber 3035 - starting problem

[007Sub]

Originally Posted by TheHitcher

No it won’t stop when it’s running. It will work perfectly until the mainspring is fully unwound. It only stops, and that happens sometimes, majority of the time it doesn’t happen, it will not start after pulling the crown out and pushing it in. So the balance stop lever is disengaged and it will not start. A shake will get it going. There is resistance somewhere that happens only occasionally. If I case it and wear it, I won’t have any issues unless I pull the crown out and push it back in. 9 out of 10, it will be fine but there is the odd time when it needs a shake.
I have tested this without the cannon pinion, disconnected from the dial side and the issue remains. The issue is not connected to the wheels on the dial side.
Yes, it’s the bushing in the barrel bridge that was worn out and replaced, the endshake has been adjusted.
So there is the odd time where there is a very slight resistance when I push the crown in to disengage the balance wheel and the stop leaver and also, when I start winding the watch, the resistance is there. It takes at least five turns of the barrel to start. A shake resolves both cases which I think is one case, not two different cases.
There are score marks on the upper escape wheel setting, on the underside. That will be from a previous assembly, the escape wheel pivot pushing against the setting. I think the escape wheel pivot might not be absolutely perfect because of this and causing this issue. I have ordered a new one which has been taking ages to arrive so I will know when it arrives.
For sure, the issue is the train. Cannon pinion removed and once I caught it when the escape wheel wasn’t engaged with either pallet stone. It’s somewhere from the barrel up to the escape wheel. The score marks on the underside of the escape wheel setting, in the brass section, make me think the escape wheel pivot is the issue.

Could very well be the escape wheel especially since the issue is so intermittent meaning it would make sense for it to be a lower torque area. You might already have mentioned this but have you checked the locking planes of the pallet/escape wheel interaction? Perhaps pallet stones need to be adjusted.