John has it absolutely right -- if you don't remove the black from the center, the solder won't bond.
Poppyl
I just scrape the side of the center rail with an exacto knife where I want to solder a wire onto. Then I tin it there & have never had a problem. I also scrape the sides of the outer two rails . I have also done like Chuck, putting it up the inside, but usually I have the track down already, so I solder it in place.
Thanks, John
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