Without getting into details I found today that you CAN drill a larger hole in a hole using a larger forstner bit.
I had previously drilled a 1/2” hole thinking it would allow plenty of clearance for sliding up and down freely on a 7/16” dowel rod. NOT !!
I should say that the piece to be sliding was about 7” long with a hole on each end to accept the dowel rod. Nothing precise just wanted it to be smoother.
Solution without starting over ? I put a champfer on the top and bottom of the existing hole which opened the drilling area up. I then selected the forstner bit, a 5/8” and centered it on the existing hole. I then brought the drill press fence up tight on the material while still hoilding the bit in place. Again with the bit in place I started the drill press and preceeded to finish the drill thru into a donor board.
Forgot to mention that the champfer was wider than the bit I wanted to use therefore already somewhat into the material.
It was a big guess that I wouldn’t get any tear out on the bottom with the champfer and I was right.
-- Dick, Malvern Ohio - Your imagination is your only holdup