I have a Hamilton 940 which I've cleaned and lubed. The amplitude is very weak while dial down and this is as strong as it gets, dial up it just stops. There seems to be far too much play in the pallet fork, or end shake. I've inspected the jewels and all 4 pallet fork jewels seem to be in good condition and set properly, having the proper distance. The pallet fork seems to have good pinions, but I don't really have anything with which to compare. I would think that if the pallet fork were falling out of position while dial down, it would disengage from the escape wheel and the watch would simply spin at max rate, not stop. The watch is a later 940 which went to the finishing department on October 20, 1911 and with serial number 924655, meaning it is double roller, has the one piece pallet and fork, and of course the motor barrel. The behavior is similar to watches I've had where there was a chipped jewel, however all the jewels seem to be fine when viewed through a 10x loupe. I'm at a loss for what could be causing this watch not to work properly and have spent many a day taking it apart, inspecting it, and reassembling. I've cleaned it a few times, keep looking over the hairspring for dust or hairs, but just can't seem to find the issue. The only thing I come back to is the end shake, but I'm not sure if excessive end shake could cause this, or even if the end shake is actually excessive for this watch. Any insight would be highly appreciated. I'll post pics as requested since I'm unsure what would be useful at this point.