THAT is why I despise tape of any kind on a machine bed. I will never ever ever, not in million stitches, will do that to a machine.
I've got many choices of bed mounted fabric guides and 1/4" feet to use. The feet and guides are easy to find and cheap compared to a damaged machine finish.
Now, get some Tester's gold model paint and the smallest brush you can find. Touch up the boo boo and when that's dried, touch up the shellac with Glenn's method. Should be really easy.
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Joe