In a previous attempt at mounting the F-633 Control Column Brackets, I mated the right bracket to the incorrect set of holes. In this work session I mounted the replacement bracket to the correct set of holes. I get the bracket in the best position, for the first hole I measured to the correct position and marked it. Then I use the drill press to step the hole up to a #12 by starting at a #40, then stepping up to a #30, #20, and finally a #12 drill bt. To drill the lower hole, I drew a line down the lateral position of the bracket. Then braced the bracket into position, with the line through the center of the lower hole. Then marked the lower hole using a #12 drill to lightly start the hole, then finished the hole using the drill press. Finally I mated both brackets to the aft Center Bulkhead.