I recently got this beautiful singer hand crank from 1937 and it was working fine (as in I completed a first project of sewing a laptop case)….UNTIL…! On project 2 (summer pants/trousers for my kid) I ran out of thread on the bobbin. So I put the same thread I had been using up to that point on the bobbin, rethreaded everything and now I can’t get the thing to work anymore 😩 it’ll sew a stitch or two and then just leave the thread draping on my work without interlocking = no more stitches.
Initially I thought there must be more tension on the bobbin now because it’s fuller so I adjusted the bobbin tension. Then I thought maybe I overdid it, adjusted the top tension… adjusted both tensions a million times but both threads pull out nicely by hand…
Then observed that it would sew a few stitches until the top string gets too tight and fails to make the loop around the shuttle so I thought maybe the foot is pressing down to strongly on the top thread so I loosened the foot pressure…
Now I’m wondering if it just needs thicker string? But why did it work OK before the bobbin change and now it’s not working?
What am I missing? Please help 🫶