After drilling the pilot holes for C8, I used the countersink from a Kreg pocket screw jig to bore the holes close to specs. Then used the larger drill bit in a drill at first to get the depth closer. Then I put the bit in an arbor to run by hand. I made a feeler gauge to check depth and then cut teeth into a longer screw's head to flatten out inside face of the screw hole. Have to be careful when drilling deep as the bits want to grab.
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