Been a professional mechanic for a long time. I use a die grinder and 3M "rubber" Roloc bristle disc wheels. Yellow is best for aluminum and green for steel or cast. Don't run the grinder any faster than necessary to remove material. Don't press too hard and keep the disc as flat as you can. They will last a long time if you use them right. I can make one wheel last for a complete engine overhaul on a V8 or straight 6 motor.
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