William made a belt for my Wheeler & Wilson out of a bootlace (108 inches, but was cut down quite a bit) and a piece of wire to hold it together, which is what the "real" belts are...MUCH cheaper than the 8 to 10 bucks that they want for them when they actually call them "treadle belts"!! :)
North, have you looked on Needlebar.org? Or can you post a picture so that we can look for you? :)