Aft sides of both the spars on the HS. Had to fabricate the 2 small HS-909 shims for the top spar. Drilled out the one 1/8" hole in the shims then match drilled the other holes to the spar. I drew a center line down the middle of the shim, then lined it up so I could see it in the holes, then match drilled.
I also match drilled all of the hinge brackets on the rear spar.
