You can also use a larger drill bit as a countersink. I sometimes have done that, twisting the drill between my fingers gently on the hole to provide a small relief and deburr it, so to speak. I am a bottom feeder from the very start, and have never tied to top feed. I just loosen things up, lift the arm and lock it, tilt my head if necessary, and feed in the blade sort of like Travis does, pinched just shy of the end. It's the only way I have ever done it, so, for what it's worth.