This bit is rather dull but is important for future reliability.   Peco give instructions to remove a pair of wires on the underside of points if you wish to independently switch the polarity of the frog and not rely only on the contact made by the blades. I can't imagine anyone wanting to rely only on the contact of the blades but I like to go one step further than removing the wires. I put the feed wires across the stock rails and the the fixed part of what becomes the blad
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