Surgery

The film advance lever on my sister's camera is jammed. I am completely unqualified to do anything about it, but for a 1960s model Petri SLR she picked up from Oxfam several years back (and loves unreservedly) getting it fixed would probably cost more than she paid for it.
Cue much googling of internet forums and wielding of very small screw drivers.

Man, they really built these things, didn't they?