janceejan,
You might also try:
The Featherweight 221 Factory:
http://thefeatherweight221factory.com/
Thayer Rags:
http://thayerrags.com/
TIP: Leave the old part in place UNTIL you get the new part. Then photograph the assembly when the take up lever assembly would have the arm at it's highest position. When you instal the new part make sure it goes in exactly like the old one, and that all the parts are oriented the same. If you don't get it right you could have tension problems that will not be fixable.
Joe