space is an issue with my machine. There are protrusions in the casting that the nut has to pass through. Perhaps the nut you depict could be slimmed down? I cannot quite see how your depth stop works. All I see is a knob, and a block. Also, my designs are limited by the stock I have on hand when I make things. I do not have any round stock really. The thickest steel I have is some half inch thick flat bar.