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| The holes are supposed to be countersunk so that the countersink just reaches the bottom side of the aluminum. After getting the countersink to just start touching the aluminum, you need to plunge by the thickness of the material. I tried a 5 flute countersink (typical for woodworking) and it didn't work very well. I found the single flute countersink worked much better (you're removing 1/5 of the amount of material). Bigger... |
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