Pro tip: a tiny screw from a $2 reading glasses kit saved a Kodak Retina I was stuck on for 9 days
I had a Retina IIa on the bench where the film advance was slipping, and I tore the whole thing down 3 times looking for a bent pawl. Turned out the tiny spring for the advance lever had lost its tension, and nothing in my parts box was close enough to work. After 9 days of staring at it, I grabbed a $2 screw kit for reading glasses at the pharmacy, and one of those little springs was almost an exact match, just had to trim it a hair. It's been holding for 40 rolls now. Has anyone found a good source for small springs like this, or do you just harvest them from junk cameras?