I recently purchased a Powermatic 3520B lathe from Craigslist. The lathe weighs 630 lbs and I wanted a mobile base but did not want to pay the $350 or more for one that is sold for this lathe. The commercially available base also sticks out about 10” on the outside of the legs. With a little head scratching I came up with this idea. I already had 3 of the wheels from on older machine. I ordered the 4th wheel from Rockler with my 20% coupon and purchase the remainder of the material. 1 1/2” square tube from a steel supplier and threaded rod and nuts from HomeDepot. The entire project cost me less than $45. These wheels raise the lathe about a 1/2” and only sticks out about 4” when the lathe is down.