I first drew the bend line 5 3/16” from the end of the spar. I then marked a line 1/8” forward (back towards the end of the spar). Per a discussion with Vans tech support, we came to the conclusion to mark a hole in the middle of the flange radius to allow proper clearance. The drawing “F-F” says to mark that 3/16” from the outside edge of the spar. But instead, it is best to mark and drill the hole at 1/8” inboard from the bend line and in the radius of the spar flange. I then used a spring loaded center punch to give the bit a good start. ** Notice the indent is in the middle of the flange radius.