In article , Jeff Wisnia says...

It was only a few years ago I learned that you can get the legs of a
four legged stool to all contact an uneven floor and eliminate all
wobble simply by rotating the stool around it's central axis. You'll
find the spot where all four legs are touching within a quarter of a turn.

Of course this doesn't work if the floor is flat, and the
stool has unequal legs!

Jim

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