Originally Posted by deadduck
angelfood, you probably know this already, but it might help someone just starting their build.
The horizontal stab has a notch at the leading edge, which is covered over.
It indexes to the little block.
Very tight fitting, I almost feel that it does not need glue. Will just put a little on edges once it's centered.
Duck, the following is from the instructions you provided by link, and though I would have done as you did, I followed these (I doubt it matters):
There is a pre-existing notch in the trailing edge under the covering. Locate it, expose it and align it with the notch in the rear of the fuselage. I test fitted it and traced along the fuselage onto the stab with an x-acto and then removed the covering in that area for gluing.