So far the best result has been rapping on the drop tube with a plastic handle screwdriver. I just invested $14 in a pound of 3000 screened graphite. Going to put about 5# of shot and a couple of tablespoons of graphite in a coffee can, tape the lid to prevent a real disaster and roll it around on the floor. Slicker has gotta be better but I think I'll still require some tapping.
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