Block blowout without a backer board
I have to drill a large access hole in a cabinet. Unfortunately, my clamps won't reach to secure a backer board. How do I prevent the plywood from blowing out?
—David Wise, Fresno, Calif.
If you can't clamp on a backer board, David, instead create two clean fronts by drilling from both directions using a starter hole to guide you, as shown above.