Clamped the F-796B angle in place on the left side and used rivets in the skin to F-902 holes for alignment as cleco's interfered with the drill, then drilled the F-796B per the plans. Removed the angle and match drilled the C and D spacers to the angle. Cleco'd all back in the fuselage and alignments were good, a quick pass with a #40 bit was all that was required.