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Well, if you actually read what the guy said... you don't necessarily have to scrape away. For some reason he did it that way, but to achieve the same effect, you could just solder a small piece of copper wire between the two points he mentioned.
All he was doing was removing a physical barrier between the two, so why do it that way? Why not just go around it?
You might have to remove some of the insulation from the two points as well, but that's not quite the same as "scraping away at your card." Just a thought.
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