I'll probably just pop it open and try it--but I am thinking about scavenging the mainspring from a 1970 Sears Malibu (Messa) that is pretty terrible and pop into an L22 with a broken spring. It looks really little and maybe will fit? Before I get the dremel and just try to fix the broken Olivetti spring, which don't know if I'll get the halves back together because I had to mangle them to get it apart and confirm it was broken in the first place...do you think it would work? Thanks!