In a message dated 4/1/2010 3:58:02 PM Greenwich Standard Time, K7LXC at aol.com writes: Should I drill some holes and then split the rock or would a jackhammer work? Any other methods to try? Tnx. Depends on the type of rock. If they're sandstone you can probably jackhammer them or something similar. Granite....good luck! Bill KH7XS