Fitting the flap. Really want to make sure I can get both flaps to align properly and symetrically. I used alumunim tape to hold the flap in place once I was happy with the alignment, because you have to match drill the hinge with the wing skin and flap support bracket.
This worked out very well ... I took the measurements from the flap hinge installed by the previous builder on the right wing to make sure the left agreed.