I used Gorilla Glue. Applied thin coat to fuselage opening parts, thin coat to stab. Let it "cook" for about 5 minutes, wiped off MOST of the excess, and slid it home. Taped/pinned/braced to hold alignment. Couple of wipes of excess during curing, being careful not to bump alignment. Perfect.

It is incredibly strong, as I have done some pretty unreal things that would twist a tail off if it wasn't well glued. There are lots of ways to do it.... mine is one.