I am in the "drawing board" stages of a project to run Torrington roller bearings in stovebolt rocker arms, with full floating rocker shafts that don't wear on the bottom only. "Worn out" rocker shafts will be ground to a smaller diameter to match the ID of the needle bearing with a tool post grinder, and will be set up to rotate in the rocker shaft standoffs to equalize the wear all the way around the shaft.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!