The Singer 9Ws are Wheeler & Wilson sewing machines with a domestic Singer sized bed. I own at least five of them plus several 9s and D9s, three 8s, 3 curved needle machines. Two of my D9s are hand cranks. Singer used W&W parts to build machines until the "in stock" parts ran out. I admit to being envious of W&W8 hand cranks.
Additionally, I have a 10W (I don't remember the sub model) that must have been dropped as the take up bar has a replacement? tip welded onto the original lever. I do not know whether the hand crank is original.?
I also have a 12W102 that I use in a Singer 31-15 treadle. The machine base is a bit to narrow, but it does work.?
I brought to Iowa a Singer 9W with a special needlebar that has an adapter for Low Shank presser feet. This adapter does not fit on my any of my other W&W machines. This machine was found in Upstate NY by Ray Slow Sew Waganka from WeFixIt. Treadlers who see the low shank presser foot try to treadle with the hand wheel moving counter clockwise which the machine does not like and makes a loud clicking sound. I remind them to treadle so the hand wheel turns clockwise.
Several years ago, I obtained an 1890 Jones Spool treadle in a lovely walnut case. The decals are lovely. This machine uses different needles from the W&Ws. It resembles a W&WD9 with a "fat pony" shoulder. Also, the band wheel is fastened in place with a cotter pin.?
?It was not the house size. It was the economy. Research has shown that European hand cranks were popular in poorer countries as they cost less. The Germans and the Americans had more money available and purchased treadles. Perhaps I read this on the Needlebar site.?
-Phyllis in Iowa