At the risk of drawing the ire of those with formal education and training ... I tore down the 17 jewel Hampden last night and found the lower jewel on the 3rd wheel all but gone. There was a tiny sliver left and a big hole where the jewel used to be. It was really late, so I left it apart on the bench and "slept on it". Using stumps that I made on my drill press, I was able to remove the old jewel retainer and ream the hole (ever so slightly) to accept a jewel removed from a model 1883 Waltham that had a hole that favored the pivot on the pinion. It went quite well actually, but the hairspring in this watch is fouled up, binding against the balance wheel. That job is for another day. But once that is sorted out, this watch has no reason to not run.
It's actually amazing that the balance staff isn't wiped out. If you'd seen how this stuff was packed ... you'd know why I say it's "amazing". The movement was not in a case. It was simply tossed uncermoniously into a ziplock bag with everything else with nothing to offer it any protection, and shipped cross country. Somehow, the pivots on the staff weathered the storm.
I polished one of those filthy 18s cases and got the movement installed in it without any real problems. I have grown to really dislike those half headed case screws though. It was a "half headed" idea at best, concocted by somebody too lazy to turn the screw 3 or 4 more revolutions. I'll bet those screws are responsible for 80 percent of fractured dials from folks applying too much pressure to the dial in order to get the stupid screw started over the ridge of the case. I'm going to buy a bunch of real case screws and toss these in the trash routinely in the future.