A while ago I posted about Singer 401G and 411G. I have not modified the machines to accept a leather belt. I'm wondering if you know anything about putting them on a treadle. The sewing machine shop guy wants to modify the balance wheel - he says it needs a heavy old one - they don't just fit on.
http://www.quiltingboard.com/t-43881-1202.htm#3520792
and
http://www.quiltingboard.com/t-130994-6.htm
I have a Bernina that may be a good candidate for a treadle. It is a 530 with a broken cord acceptor part.
What did you do to adapt?