Whenever I have to drill a hole in a cabinet wall or other vertical surface, it’s often important to make sure the hole is square to the surface. When maneuvering the drill for this, it’s pretty easy to sight square side-to-side. However, sighting for up-and-down is awkward at best. To help, I attach a small spirit level vial, often sold as a bullet, torpedo, or line level to the top of my drill using hot-melt glue or double-faced tape. Just make sure to locate the vial so that it reads level when the bit is level.
—Joe Pestana, Stoneham, Massachusetts
