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Use a fine file. Lightly file away the rails just so it's snug and not tight. Then use fine sand paper to smooth it out. Go from 400, 600, 1000 and 2000 if you want. If it's just snug, use the sand paper and finish it with the tooth paste. Take your time and take off just a tiny bit at a time. You can take off but can't put back.
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