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Take a look at cam-locks. These are adjustable cam action levers that you could use on the inside with a wide head bolt that you see used in furniture. You can probably find them in McMaster-Carr or a Graingers catalogs. May even be found in HD or Loew's.


Wouldn't that still require the underside to be flat?

One option I am considering is using a really wide (like 1/2" or bigger) drill bit, and from the underside use it to just level out a little circle, so the nut (or bottom of nutsert?) can sit flat inside said circle.

With 200+ Billion electrical parts, the world most complicated machine is inside your own skull.

Question Reality.
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'89 Rnr DLX "SR4.5", 32s w/ 5.29 locked f/r blah blah