I purchased a restored Seth Thomas 89 J movement from a person on eBay that had restored it )Put new bushings in, cleaned it, new springs, etc.). I just popped my old movement out and plugged this one in and it worked great - for about two weeks. The second time I went to rewind the 8 day movement there was a loud BANG and I found my mainspring sprung. I emailed the seller, and he had me send the movement back and he put a new one in for me (for an additional cost) as I had no tools to do it myself. The clock came back and I plugged it back in and it runs fine and has for years. However, after about 6 days it wants to stop. In looking at the movement the strike spring is mostly unwound as is normal after several days, but the new mainspring the guy put in is still wound tight with only the last few outer bands showing any real gaps. I oiled the springs with Mobil 1 5w-20 oil as I usually do and when I wound it up tight a tad squeezes out between the springs throughout the coils, so I am pretty sure this is not an issue with the mainspring sticking - it just does not unwind much at all.
Since it lasts six days (even though the spring still looks tightly wound) I am not sure what to think about this, and I could find no other posts on this. I would not think it would be "set" as it is fairly new. Is this normal?
Since it lasts six days (even though the spring still looks tightly wound) I am not sure what to think about this, and I could find no other posts on this. I would not think it would be "set" as it is fairly new. Is this normal?