None of my set screws on my 3 nova chucks line up with the shoulder they are supposed to tighten to. They are right on the edge so they mess up the edge on the shoulder. I cannot seem to find a spacer that I need for this. I'm guessing I can't just use any washer, as they are not machined to flatness. It needs to be pushed out toward the end of the spindle about 3/16" to be in the right spot for the set screws. The lathe is a Harvey T60-s.