My 1940s Singer sewing machine was working fine until the needle arm and hand wheel froze. When this has happened in the past, I usually waited a moment and the hand wheel and needle arm relax and I'm able to continue. This time, the bobbin thread broke (I think I extracted all the pieces from the bobbin socket) and the hand wheel and long needle arm completely froze in place; they won't budge.
The motor seems fine and was recently oiled and overhauled so this seems to be something with the handwheel or bobbin area?
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Before you take it in for expensive servicing, which you may need to do, take a warm/hot hair dryer and blow the heat into the gears. This will unstick the hardened oil or grease. Since you just had it serviced, this may not be the problem through. It's worth a try, and doesn't cost you anything.
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