I'm working on a 1940s typewriter and need miniature springs (mostly extension spring, but I also need torsion spring). They have to be small though, say 0.1" OD and about 0.5" long (or less). Anyone done repairs on small moving parts/assemblies that need springs? I'm trying not to cannibalize on other machines until I have to. Is there an online store that sells a box of mini spring assortments?