After coating the faying surfaces with JC5, a nice little job clecoing on the nose skin …
… followed by the top skin, which slips between the nose skin & spar.
I decided to check for any twist. Vans suggest you place a digital level on the rear of each hinge, making sure they are the same angle. But I found it hard to keep everything stable enough to take any usable readings.
So I set up my laser level so as to compare the line of the spar with the trailing edge.
I aligned the bottom of the spar lightening holes with the laser line, then compared to the trailing edge …
… on each end.
The left flap was perfect, but the right showed significant twist.
So I un-clecoed the nose skin top and re-clecoed whilst the flap was weighed down flat on the workbench.
Happily this sorted it, and now both flaps are perfectly flat.
It just goes to show how a very small alignment change on the nose skin to spar joint can cause a big effect on twist. So I’ll keep a careful eye on this throughout the riveting of the nose skins.