Install T-nuts easily with this ace of spade bits
Recessing T-nuts flush with the surface of a shop jig requires at least two bit changes with standard drill bits. So I came up with an easier way. By modifying a 3⁄4 " spade bit using a grinder and file, I now drill a 1⁄4 " hole for a bolt, a 5⁄16 " hole for the T-nut's barrel, and a 3⁄4 " counterbore for the T-nut's head all with one bit.
—Lynn Potter, Green Valley, Ariz.