I read in sci.electronics.design that pest3125
wrote (in . com) about
'The PEST project - completed.', on Tue, 11 Oct 2005:
It needs to be made of hardened steel for ball bearings to work well.

Try aluminium with a smear of oil. It's a little-known fact that Al/hard
steel is a non-wearing combination. See Austin 7 crankshaft main
bearings. Ball and roller races directly inserted in an Al casting(;-)
--
Regards, John Woodgate, OOO - Own Opinions Only.
If everything has been designed, a god designed evolution by natural selection.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk