Everyone but me probably already knows about these. But, I had never seen one until a couple of years ago when Tim L. used a self-centering drill bit while installing my cockpit hatch. With this bit, after the hatch was laid in place for a dry fit, it was just a matter of zip-zip-zip and all the pilot holes were drilled - each nicely centered. I finally got one this Summer and have found it very useful for reinstalling the various pieces of hardware. I got a #8 which has worked fine for everything so far...
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