Singer 7422 "shoes problems oils" Questions

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problems today where failure of mechanical functions are due to sticky oil and grease varnishing. (more on that subject upon request on this site). The machine were designed for class 68 machine oils

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Question about Singer Sewing Machines

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My machine is making a knocking sound and then the thread bunches on the bottom. It is threaded correctly. Bobbin is in correctly. No jams in the bobbin area. We did take the bobbin case out their ...

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