Marked off a vertical line on the right side back of the interment panel next to the instrument holes to the right side of center. Marked off three points on the line each 1 1/4 inches apart. Adjusted the second or middle point to 1 inch from the first or top point. Used a center punch on each of the marked holes to provide a divot at the drilling point. Drilled a 3/8 inch hole at the third point. Used a pointed router bit to remove material to form a vertical oval to fit the rotary four position switch. Installed the switch in the oval and tighten it in place. Placed the knob on the switch to complete the installation.
