I've got one of those medium sized TLC electronic distributors used from 78-90 that I'd like to use as a replacement for my old points dist. It has a dual diaphram advance, but one side leaks - the inner side. Any of you 2F owners know if that the primary or secondary side? I would imagine it's the primary. Anyone have a used one out there, or know of a source for used? Are those dizzys USA only? Thanks