Joints in legs?

I am just replying to keep the message on top of the spam attack. (on
Google, there is a list of active messages, and the flood attack will
quickly push out any messages without a reply)

Hopefully, it has died down for now, as forseen by those on here with a few
old "war wounds".

My robot has wheels, so it has no knees.  But it does
have a shoulder, elbow and wrist.  For each joint, I
use a pair of sealed ball bearings pressed onto a
section of stainless steel shaft.  Cheap, easy and
reliable.  I wouldn't even think about making my own
bearing races.  The shaft for the shoulder is 3/8", for
the elbow is 1/4", for the wrist is 1/8".