go to my page and do the Ritter mod. Pics are there to guide you. Really works well.
http://pages.prodigy.net/jforgione/MB_S500.html See MENU #19.
Some corrections:
psfred:
The bimetalic spring rotates the pin. . . No it doesn't ROTATE the pin. It PRESSes on the pin clutch with about 5lbs of pressure.