I wonder why a halfway competent machinist couldn't make his own shaft and bearing assembly, using readily available standard parts, and not have to pay an outrageous price for somebody's "kit"? Even if the shaft needs to be hardened for some reason, either air, water, or oil hardening drill rod is available in all sorts of sizes, annealed for machining and able to be hardened as a final operation. I can't really see a need for hardening the shaft, however!
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!