Ok here is the problem.
My Aresti is down for the count. I was moving it and whacked the tail good. This managed to jar the horizontal Stab loose. Thankfully this happened now and not in flight. I am trying to figure out the way to fix this. I really don't want to cut the Elevator off to do it. But that is the only way I can think of right now.

If you can move the stab side to side enough, you can re-glue the old joint. Slide it over and use a T-pin to make small holes on the old glue line. Do that top and bottom. Bend a T-pin at the end and use that to puncture the old glue line on the fuselage. Mix a batch of slow curing epoxy and glue it.

If that won't work for you, you can install round toothpicks through the fuselage and stab. Use a slow cure epoxy here as well. Drill the toothpick holes so that the pick is snug. Before the epoxy cures, cut the toothpick flush with toe nail cutters. Wipe up the excess epoxy with a paper towel and denatured alcohol. Use a hole punch to cut small circles of the matching Ultracoat and cover the ends of the toothpicks.

I haven't looked at an Aresti but if possible the easiest way would be to...

Slide it over and epoxy it and slide it back in...once that sets put you a piece of triangle stock under each half for the full length - cut the covering etc... and epoxy that to hold it tight.