3.5 hrs, 149 rivets
Match drill trim servo brackets to cover.

Countersink trim servo cover.
Debur, clean, MEK, and prime brackets.

Rivet counterbalance skin to ribs.

Rivet trim servo brackets to cover.

Rivet nut plates to trim cover reinforcement plate.

Back rivet top stiffeners to left elevator skin.

Cleco spar to skin.