Marked door 18 3/8" from interior front corner. Cut 13/16" x 2-3/16" slot in bottom of door centered on mark just made. Driled 1/2" hole 29/32" above center mark. Created 1/2" slot to bottom of door.
Removed top of gear box and clamped over top of hole. Drilled #12 the four holes. Mixed structural epoxy/fiber mix and glued the two supplied fiberglass blocks into place.