When you set your vintage Singer sewing machine into bobbin winding mode, by cranking the stop-motion wheel counterclockwise, the needlebar is supposed to stop running. This is to save unnecessary wear-and-tear on the machine, and prevent you from having to unthread the needle to wind a bobbin.
However, if a few crucial parts of your machine are dirty, the needlebar will continue to move even though you are in bobbin-winding mode. This is easy to fix, and I've made two relevant videos, below, to assist you.
This first video explains the parts of your machine involved in engaging and disengaging bobbin-winding mode. If you are not interested in the mechanics of how your machine works, you can skip this first video (though some of you may find the "X-ray" part that starts at 3:15 in the video to be informative).
This second video, below, is where I show you how to actually fix the problem. The video may seem long, since I'm over-explaining things; but once you understand how to fix this, you will be able to fix this problem in mere minutes.
Note: If your stop motion clamp washer doesn't look like the one in the video, but looks like this one below...
...then click here to see how it goes on.
The oil I'm using in the video is Tri-Flow oil, my favorite. If you cannot find it near you (it's often sold at bicycle shops), here's an Amazon link:
Happy fixing!
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