Patent ID: 7827669

Claim:
A method of joining together a first and second workpiece, the method comprising; drilling a first hole at least partially through the first workpiece with a drill bit oriented in a first direction; placing a target magnet in the first hole without completely filling it; placing a drill guide with a guide magnet or magnetic field sensor next to the first workpiece; adjusting the position of the drill guide until the guide magnet or magnetic field sensor indicates that the drill guide is aligned with the target magnet; drilling a second hole at least partially through the first workpiece with a drill bit oriented in a second direction which is not parallel with the first direction, the drill bit passing through the drill guide and through the first workpiece into a side of the first hole at a location where the first hole is not filled by the target magnet; removing the target magnet from the first hole and the drill bit from the second hole; inserting a fastener through the second workpiece and into the first hole; inserting an anchor into the first hole via the second hole; and securing the fastener within the first hole with the anchor.