I have a late model Singer 15, with number tension dial. I've set up a few vintage machines, but this has stumped me. The thread is being picked up from underneath, but will not form a stitch at all. When I try to sew, the thread comes off the spring. Could it be timing? Any help would be appreciated as I don't have much hair left!
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It doesn't sound like the timing - it sounds as though the bobbin gear is gone. You could try fixing this yourself, or you can take it to a professional.
If you want to give it a go, message me (click on my screenname and it should take you to a box to write me a message) and I'll come back here and post a link to a refurb manual for these old lovelies:) They really aren't that hard to work on at all, the most difficult thing is finding replacement parts - and I can also post a link for you to a USA based parts supplier (he also gives a lot of information on his site, some free, some low-cost).
Otherwise, take the machine to a repair tech with experience on these vintage machines. The 15 is a little different from the 99 and 66 models I work on the most, so I may be wrong about the bobbin gear (but I don't think I am as what you're describing is pretty much a universal symptom of bobbin gear failure).
Best luck getting back to sewing, and well done for having such a lovely machine!
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