Ok Wiz thanks.Neat gadget! i bet you dont buy a lot of socks then.  Folker, according to the singer 29k171,172,173 manual the 172 is the large bobbin machine. when it refers to putting the spool in the shuttle the first example says "for 171 and 173 machines and the second example is for the 172 large bobbin. do the gears from college sewing fit well in these newer 29s??