Turned wing over on bench so bottom is facing up. Leveled spar end to end with a water level. Squared spar 90 degrees to workbench and clamped with wooden spar supports & c-clamps. This will hold the spar square so rear channels can be leveled & there is no twist in the wing. Leveled rear channels one at at time with water level. Supported them with the 2x4 rear channel supports cut at a 15-degree angle to match the curve of the upper skin & screwed them in place to the bench. Also checked with spirit level, metric scale & square. Spar is square & level, all the channel is level. There is no twist in the wing, it is flat. Ready to drill & cleco lower rear skin (7V7-3). Ready to drill & cleco skin.
