The left wing isn't closed up yet, so I'll probably drill off the inbd aileron hinge and complete SB16-03-28 on that side. I'm not excited about drilling off that hinge, especially when I can see that the angled doublers installed in this SB are going to cause a real problem bucking the skin rivet in the lower skin right behind it. But, it's a situation where I can do it now, so I probably will. When I got these wings, I discovered that they were the vintage that had underbent rear spar upper flanges. What this means is that at the flap wells, the upper skin "ski-jumps" instead of flowing in a straight line to the t.e. Vans is aware of this and has a loaner tool which will latch onto the flange and bend it into the right shape and eliminate or at least minimize this and so that the flaps will tuck up under the skin like they are supposed to. I contacted Vans a while back about getting this thing and was told that another builder had it and I was on on the list to get it when available. Since I'm planning to have the aileron hinge off to do the SB, it seemed like that would give extra access to manipulate the spar flange in that area with it out of the way, so I decided rather that waiting for the vans tool too be available I could probably build my own tool. I had a couple of pieces of heavy aluminum bar stock about 3.5" wide and spend about an hour or so crafting them into a giant clothes pin with nicely radiuses ends and reliefs for the rivet tails and dimples. There's no way I'm doing SB16-03-28 on a closed up wing until/unless I have to, but the fully skinned right wing had the worst t.e. issue, so I decided to see if I could fix it before I dug into the SB on the left wing. Just by sighting down the t.e. you can see how the aileron closeout has pulled the upper skin down into the correct position outbd and how the inner section ski-jumps up where there's no substructure to pull it down You can also get an idea of where it should be by laying a straight edge chord wise along the upper skin at the trailing edge. It shouldn't have any curvature back there at all. Basically, I started at the inner aileron hinge and worked toward the root, flexing the flange until everything was heading in the right direction. I went a little bit at a time so as to not stretch or deform the skin, laying a straight edge chord wise on the upper skin t.e. as I went to check the results. I went over it 5-6 times, bending it a tiny amount with each bite until I got a satisfactory result. There's still a deviation of maybe .10" in a few places, but the trailing edge skin now flows straight off the wing and the flaps should nest nicely so I'm going to leave well enough alone. Next session, I'm planning to do the same on the left wing, as well as SB16-03-28.