Quick and Easy Black Powder Ball Mill — Skylighter, Inc.
Put a drop of light machine lubrication oil, such as 3-in-1 oil, at the four points where the rollers enter the plastic bushings. ... Powerful black powder can be made with mill runs of between 2 and 4 hours. Use long drop cords. Unplug the cords at the electrical source, not at the ball mill, when you want to stop the mill.
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