I would suggest trying a very fine tooth hobby saw (hand held), non powered to actually cut the steel of the track. Since the teeth are slowly abrading away the steel, there should be no flash to clean up. Anyone ever tried this, and have a saw they like for this task? If using a hacksaw blade, I would use at least a 32 teeth per inch. Problem with a hacksaw blade is that the are wavy, and cut with a wider kerf. I don't know if they come any finer than this, but hobby blades should be available with more teeth per inch.
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