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a file is the best way, or pretty much any hard, rough edge
smash them into the ground until the edge breaks off
for my rail sliding edges i take a flap disc, 80 grit sadpaper, then 180, then 400 and they are nice and smooth and you dont get the burrs and checks, and sometimes dents you'll get from sliding sharp edges. althought they don't make that SCRAPE sound anymore, just a smoother kinda "shink" sound.
if ur gonna do that just use ur dynastars lol