I used 5/16" - 18Tpi threaded rod. It was the easiset to deal with without finding someone to turn the ends down. I did need to grind one end down to 1/4" to fit the motor coupling, but that was easy because I just needed to grind it down just till the threads were gone. Ginding down a 1/2" rod to a centered 5/16"/22mm to fit the thrust bearing would have been a bit more risky and if done wrong would cause binding and vibration. If everything works well I might jump in again and try 1/2" and have someone turn it on a lathe. |