I avoid cotter pins and cottered cranks like the plague hence my answer is see the LBS. Make sure it's one that's been around awhile as alot of newer mechanics might not know what to do either.

The cups and rings should all be Italian threaded and available. If the LBS has the proper tool for removing the cotter pins (a press) then they might be reusable but should be available anyways. If the spindle is shot, I don't know.

If the bike had a cotterless crank with either an old style or modern cartridge BB I'd recommend you buy the tools and do it yourself. The tools aren't real expensive and would be a 1 time investment. However like I said before....I don't deal with cottered cranks. The Mechanic page here has the Barnetts manual in PDF. Take a look.

You could always convert to cotterless, how original is the bike and do you plan on restoring?



Oh yeah, I should've asked this right away: Is the BB loose or are the crank arms loose on the spindle? If it's the BB it shouldn't cost more than whatever your LBS charges to R&R a bottom bracket, assuming they have the tools.