Here you go. Couldn't get the page with the parts nomenclature to copy. What you want is pages 6 and 7 of the last M21 operator's annual they ever printed, which was the 1974 printing.

You can probably find one on the net, maybe even from bluepike.tripod

http://bluepike.tripod.com/Model21/InstMan/Instructions5p7.jpg

SRH


May God bless America and those who defend her.