Dimpled and machine countersunk all holes in the vertical stabilizer ribs and spars. The holes in the spar doubler plate were machine counter sunk on the forward side where this will later mount flush to the aft of the fuselage. All other holes #30 holes were dimpled with my hand squeezer. After this was complete I cleco'd together the rear vertical spar and spar doubler plate including the hinges. I taped of the clecos where the rivets are to be left off until attachment to the ribs. Everything fit together nice and flush. I will rivet these together with my new pnuematic squeezer when it arrives next week.