Center a hole to any dowel
It is difficult to drill a perfectly centered hole in the end of a round dowel, but this drill guide solves the problem. Choose a Forstner bit the same size as the dowel and drill partway through a small block. Then, use a standard twist drill the size of the hole you want and drill the rest of the way through the block. To use the jig, clamp the dowel in a vise and use the guide block to position the drill for a perfectly centered hole.
Gary Fader, Marietta, GA