I began work on the vertical stabilizer while I waited for a response from Vans on the rivet spacing issue I had with the relief hole I created in the front spar of the horizontal stabilizer. I clecoed the spar doubler and hinge brackets to the rear spar and drilled all holes per plans. I began preparing the ribs by deburring, fluting the flanges, and filing down the forward edges of the flange notches to prevent faceting. This took some getting used to. I temporarily attached the skin to test the rib fit. I ended up taking off too much material on the nose of VS-705 with the scotch brite wheel while trying to get it to fit. While I don't think this created any edge spacing issues, I wasn't happy with how it looked and knew I could do better so I ordered a replacement part.