http://www.ismacs.net/singer_sewing_...ine-manual.pdf
This is for the 411G but it will show how the 401G is set up in a treadle and how to chain stitch the 401G - they do that too!
Someone I know used a 2mm diameter polycord belt from a spinning supply store to drive it with no shredding. She said she ordered the longest piece she could so she would have a spare.
http://www.spinnerschoice.com/Spinni...s/default.html (where she found it - scroll down) If you set it too tight remember it won't stretch.
To do it without trying to grind something off the existing balance wheel we put in a bushing, 7/8” inch interior diameter, 1/16” thick, metal will work - goes way inside by the shaft. Then we pulled the motor - too much friction with it in. You may not have a bobbin winder - the wheel on it may not be big enough to still hit the wheel.
Here is a picture of my 401G - right now it has a leather belt - it rubs on the metal and shreds - the smaller spinning wheel belt will clear that and run just fine.
[ATTACH=CONFIG]341990[/ATTACH]
[ATTACH=CONFIG]341992[/ATTACH]