Steven: Rather than cut the rail, I like to put a piece of cardboard (cereal box) between the rails to keep them separated. I put a piece of wood (matchstick, toothpick) through the center of the cardboard first and put the wood where the pins used to be. Styrene would also do nicely as a separator. You'll have to form the separator (cardboard, styrene) to the shape of the rails. That's what I do.
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