Whenever 'm cutting or driling into a case, I find the shards themselves seem to get magnetized. I'm guessing that being small and hot, the cool down in the magnetic field or something. Anyway, they always seema beetch to remove - can't tap or shake them out, cant vacuum them - even using another magnet (generally a bad idea in the long run) can't pick them up. I usually have to wipe them up and hope the ones in the cracks don't float out into hardware.
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