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[SwissMoose]

I just scraped mine and I didn't really have to scratch much for it to show up copper all across the "circle", before I scraped it was only copper colored at the one corner where the trace is heading off.  Now the whole thing is copper and pretty shiny, but it is no bigger from my scraping like some pictures show.  Don't think it matters if you make it any bigger because the pin is pointed anyways so you only get contact along the inner rim anyways.  I used !/32" screwdriver often used for on eye glasses.  Good luck.