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DT

In article ,
says...
--I'm going to build a rotary surface that's being turned by
one of
those worm drive windshield wiper motors. What I need are some supports
for
the surface so that it won't sag when there's a load on it. What I'm
looking
for are those things that have a short threaded rod with a clevis that
holds
a bearing on one end. I could make 'em but I'm thinking they're
probably
available from someone's catalog if I only knew what they were called.

Can you use ball transfers? They are spherical:

http://www.mcmaster.com/#ball-transfers/=b5hlds

--
DT