RE: Pushrod Question
The Rod-Chuck system uses a #5-40 die as a first cut and then a second cut with a #4-40 die so it removes less metal on each cut prolonging the life of the die and lessening the tendancy to twist off the rod being threaded. Even though they do it that way, I don't think it would cut stainless anyway, but it is a nice trick to lessen the work of each cut.