Cut "Block A" from scrap wing foam, figuring it would be easier before attaching the winglet. Using it a guide cut another for the left Wing.
Discovered I can stop the tape falling off the nail when I measure "C" by putting a dob of hot glue on the end of the nail.
Roughly positioned the right Winglet as I did the left on the angle and prop and noticed the angle looked a bit different fore-aft between the two. Jigged the wings level and checked the actual angle with my angle finder and they were different by a lot, (I forget the actual number). This concept isn't mentioned in the plans, and I don't see why not. Decide the left is the more asthetically pleasing and move the right to match. This is also easier. Reset the A B C & added more glue blocks.
Made some more glue blocks.
Making "Block A" which the plans don't tell you to do til later.
Mmmmmm. Different. Different is bad. Note shopping back with 5kg of sand in it, 3 per wing.