Sect 9-11, Step 4: Machine Countersunk holes specific to location for FWD hinge on Rear Spar where Trim Tab mounts. (per instructions, cleco'd hinge in place under Rear Spar flange - this insures CS is guided by underlying hinge with holes, since CS goes through relatively thin Rear Spar flanges)
Step 5: Finished dimpling remainder of Left Rear Spar and all of Right Rear Spar ...top and bottom.
Sect 9-12, Step 1: Measured and adjusted flanges on Rear Spar and Front Spar using hand seamer. Rear Spar was at correct angle, but Front Spars needed approx 1 degree tweak.