David Weaver
Yes, I put some pressure into the buffing pad. Not like my hands would shake with just a little bit more, but enough to ensure that the iron is getting solid uniform treatment at the edge of the wheel.

Ply information has to go along with width, and I don't know how much it would vary based on differing ply thickness. I don't think it's too important as long as the wheel is stitched within a reasonable distance from the end. The number of plies in the wheels that I have that are 1/2 inch stitched width (The fanned open part is a bit wider) varies from 42 to 60 and all work fine.

A low number with loose space between the plies could be a problem, though.