Ben;
I believe in filing the contacts, thinking you were doing a good thing in cleaning them, you did a bad thing in removing the noncorrosive surface plating, allowing rapid deterioration of the underlying metal...you should just probably replace them at this point, and the very MOST agressive you should do to the replacement contacts is clean them with PAPER (no more abrasive than that(!), then treat them with Deoxit D5 contact cleaner/treatment*.
RJ; TNX for reference as always!
Cheers
* I'm working on a "Product Reviews" page for my site, until that is up (soon), just link to manufacturers site: http://store.caig.com/s.nl/sc.2/category.188/.f IMO, this stuff is very, very good and will feature prominently as a two thumbs up product on the page.
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