I had part of the spring in my watch and it seemed to be kinda working. Had a close look and didn't like the rusting spring half so picked it off the case ring. With mine, the movement is clanging back and forth and the counter weight rotor hits the case back now. I thought about an o-ring but finding the correct dimension may be tough. I'll take my calipers to the o-ring bin and maybe get lucky. I do have a dozen case back gaskets coming from Asia so maybe cutting a few to use as spacers will work. They seem a bit thin to get enough space filled though. I don't have pusher springs or o-rings either, so when I install those there may be enough resistance from the pushers to keep the case ring from moving back and forth?? I'll report back.