Before closing up teh levators, the plans call for a dab ("chewing gum sized") of RTV sealant to hold hte internal upper and lower stiffeners at the trailing edge. This is to reduce the possibility of the trailing edge fracturing under vibration in service.
Most of the rivets on the left elevator are the standard flush head solid type, but the sub-spar on to which the trim tab is attachedhas for rivets on the top, and another four on the bottom, which cannot be reached by eiter rivet gun/bucking bar or squeezer and so the plans call for them to be fixed with blind rivets. What the plans DON'T make clear is that the rivets called out are not the standard ones taht fit into a 3/32" hole, but instead require holes drilled out to 7/64". Why's taht a problem? Because the solid rivets get set first, and so the holes have already been drilled! Not to worry - dig out the 7/64" drill bits and enlarge the holes. Not ideal, but it did the job.
