MARK AND DRILL
Make sure the top of the mounting flange is square with the upper edge of the transom. Using the flange as a template, mark the four outside hole locations. Be sure you have access to the backside of the transom for through-bolting. If not, choose one of the alternate bolt holes in the bracket (there are three holes in each quadrant). Check for interference from hoses and wires on the inside of the transom before drilling. Drill the four 3/8-inch holes, each at a right angle to the transom.