My trim tab assembly kit had 2 trim tab horns (8H4-7) in it. One was predrilled for the attach holes and the other was not. I used the one with the predrilled holes but I just noticed that the hole for attaching the push rod clevis was drilled to a #21 not 1/8". The other trim tab horn is drilled to a 1/8" so I decided to remove the other one and install this one. Drilled out the rivets. Used double side tape on the new trim tab horn so I could move it around to where it needs to be and drill the holes. Primed the mating surfaces and rivet it to the tab. Cleco the tab to the elevator to check the deflections. The angles actually increased and was able to get 31.5 degrees up and down. I now need to cut more of the elevator skin where the push rod comes through.