Started today off with a bunch of dimpling, namely of all the spars for the vertical stabilizer. (6-3, steps #7 and #10). I'm using the substructure dyes from Cleaveland to make the skin to structure mating even closer - and the dyes work great. I appreciate that the substructure die is even a smaller diameter than the 'normal' skin dies, enabling it to get into tighter areas a bit more easily. Most of the dimpling was done with the pneumatic squeezer as the DRDT-2 just wasn't the right tools for this job (since, y'know, the ram would have to go through the other side of each spar for it to work). After dimpling all of the spars, taking special note to NOT dimple the areas called out (my marking for this is an S right by the hole), I moved on to riveting. I riveted the upper bracket onto the VS spar, as well as the doubler plate (6-4 #4 and #5), then reassembled the doublers on the VS spar. Upon doing this, I discovered that the VS-1014 L/R pieces somehow weren't final drilled (doh), so I final drilled and deburred those, then got everything cleco'd together in prep for riveting that assembly.