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Wow lazypup! You are amazing- so much good information.
But I need to correct you on something- you misunderstood something about my chair. You said,
"You stated that there is a flat washer between the lock washer and the metal base it rests on."
No, I didn't say that. But first you should know that I definitely do not have a common lock washer, I have something the manufacturer calls, a toothed washer and a plain old regular washer. And the tooth washer doesn't look like the two toothed lock washers you showed in your post. I'm sorry I can't get a picture of it to you, but it looks something like the external lock washer but with some raised ridges on the front and the back of it. And its placement: there is the knob (with a machine screw, I guess you call it), and on that is first the flat washer, and then the toothed washer. So the toothed washer rests between the flat washer and the metal, painted surface.
I've been told by fastenermax.com that I can't use a lock nut because I can't get to the end of the knob/machine screw- but what about a self-locking nut? That sounds real promising. Or I could start first maybe with your two ideas (ie. roughing up the surface and removing the flat washer) and if that fails, then try the self-locking nut.
shygirl
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