I am interested in building a pneumatic draw bar for a Shopmaster Mill Turn similar to the one offered by Chicago Lathe in the pics attached. I have built one based on a modified air impact wrence, but I think the cylinder one would be better. The price point at $700 for three $20 air cylinders and some bellville washers seems unreasonable to me. The whole cnc machine was only $6000. Has anybody built one similar to this concept? Interested in source for cylinders and specs on the size and number of washers.

Thanks