I saw on line that the 401G can be hooked up to a treadle because of the openings in the base - it would need a different balance wheel though - there is info on line:
German Singer 401G:
http://www.toolfool.org/sewing/index.htm
and
making it a treadle:
http://www.toolfool.org/sewing/401G-...d-Electric.htm
I would LOVE LOVE LOVE to treadle mine - that would be the BOMB!! I wonder where to get a balance wheel like that? Could one be made?
more on the 400G series
Same website different page
http://www.toolfool.org/sewing/German-400.htm
I also put this on the Vintage page