I have been tying on a Xuron vise since about 1980 and decided to upgrade to a rotary about a year ago. Incorporated parts of several vise designs after a lot of thought. Jaws are heat treated O1 tool steel, shank and barrel are stainless steel. ball bearing tig welded to shank for articulation, Delrin for bearing for rotary parts. Decided to try lever that can be positioned in one of 4 orientations instead of star wheel. May change that up in the future. Still need to find the right size "O" ring to put in between jaws to act as spring to open jaws. They self open a little but not much room for a compression spring in there. Used 5/16" #18 for thread pitch but would probably use coarser pitch if I make another set of jaws as faster close up would be nicer. Actually made 2 vises at the same time, one for my son. Used a small milling machine, metal lathe and drill press. I must be doing something wrong with pics and the attachment tab does not sow up unless I post, then go back and edit post unless that is how site is set up?