I back-riveted the row of rivets attaching the trim tab spar to the bottom of the trim tab. I also back riveted the trim tab horn on. I left out the rivets along the edge on each end so that the rib I’ll be fabricating can rivet through that as well.
I used a long piece of aluminum angle to ensure the trailing edge of the trim tab aligns with the trailing edge of the elevator (and ensured the inboard edges are aligned).
