Most disappointing to me are the beautiful machines with plastic/nylon innards. Here are two of mine:
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The Kennie is a Gritzner-Kayser from Germany and has a plastic cam stack for your sewing and repairing pleasure. (Actually, once the stack is cracked, the machine is toast.) The Belvedere-Adler is Japanese and has a nice, big ol' fat plastic gear controlling the stitch width. I've read that such gears should be greased but never oiled with acidic oils as they will break down the plastic surface.
I found this in a recently purchased cabinet:
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