Sew-classic sells a loosy-goosey but serviceable aftermarket handcrank set for next to nothing. I put it on a 66 a couple of years ago, and it has worked (and rattled) perfectly ever since. You do need a spoked wheel (or some clever workaround?) to use it. (Sew-classic sells those too, I think.) No, I don't work for Sew-classic, but it is my favorite place to get these odds and ends.