39-7 step 1 has you match drill the Control Sticks and the Control Stick Bases which was a little tricky. One of the Control Sticks wasn't exactly square so getting it to line up wasn't as easy as planned. The outside of the stick and the inside of the base had to be cleaned as it was a tight fit. Then installation of the WD-1010 Control Column. Had to remove the seat pan covers which wasn't too difficult. Just a few screws on each side. Then the control column slides into a slot on the tunnel sides. Then attach the column to the Control Column Mounts. Again with fitting washers on the inside edges of the bases. This time access was much better and it didn't take too long to accomplish.