RE: 4*60 ARF build disaster
I see what you're talking about. Right behind the elevator joiner, there's a piece that comes down to the fuselage. First, and this is important, and you're probablly figured it out already. TEST FIT THE PARTS DRY!
Now, I think you can safely not worry about that small piece behind the elvator joiner. BUT if you would like, you need to get some balsa stock either the same thicknes or thicker. With your sanding block, or a piece of sandpaper wrapped around something hard and flat, sand off the piece that 's glued to the fuselage. Carefully, as you don't want to sand down the fuse itself. Now, test fit the fin to the fuselage, and sand the rear of the fin untill it just contacts the fuselage. You'll probablly have to do some estra sanding to get the epoxy out of the slot it's supposed to fit in. Patience here, do a good job and get as much out as you can. YOu want the fin to fit as tightly to the stab as possible. When you get a good tight fit, just re-epoxy as per the instrutions. IF that piece on the rear of the fin dosen't contact the fuselage, you'll need to get a piece of balsa stock, and fit it in the gap. While it's PROBABLLY not critical that the fin touch teh rear of the fuselage behind teh joiner, why second guess Sig engineers? Make sure the grain runs the same diretion as the grain in teh stab. Than, like Cruzomatic said, get a couple of balsa angles and glue them next to the fin on each side for extra reinforcement. And off you go. I know it sucks that your brand new baby isn't going to be perfet, but look at it this way... it's gonna be personalized!
Andy