Q: I want to thread a 12-foot pipe through a hole in a large rock and into the ground to support a birdhouse. The rock would remain on top of the ground, but it would anchor the pipe better and more attractively than my current arrangement. I can take the rock to a shop, but where can I go to get someone to drill a hole about three-quarters of an inch wide through a quartz rock about eight inches high? A: To drill a hole that wide and deep through stone — especially a particularly hard type such as quartz — is a job for a core-drilling bit impregnated with diamond abrasive and a drill that feeds water down through the bit to keep the tip cool and rinse away debris. You might be able to find a countertop manufacturer who will cut the hole for you, because these fabricators use diamond core bits to cut holes for pipes to faucets. However, the bits they typically use are just a few inches long, enough to go through countertops. Companies that specialize in concrete drilling and sawing are a better fit for a job like yours. They typically drill through basement walls, concrete floors and ceilings, and other concrete and stone surfaces to create pathways for pipes and anchor holes fo...