I have a Thompson walking foot that I use sometimes and have someone interested in it but would like to replace it first. I would like a zig zag and would like to go to the 9" frame. I can't justify what sailrite wants for no more than I use it. There is one on Ebay for around $475. I think they are all the same, Sew Strong, Omega, Rex . But I also noticed that they have just the head listed for around $340. ,It says "walking foot" but from the picture I cant tell, I have a table with a Singer 20su that should fit in it. I sent the company a e mail asking if it was really had a walking foot but no answer. There is no name listed for the machine and shipped from Calif. (probably a ware house for China products.) I can't find anything on You tube about it. Any thoughts appreciated.