Ya, russ. I think Everyone had to cut the tube a bit. I found a regular pipe cutter handy.

PS: thats about the worst of it, but I also found the rudder base (that traps the top of the stab) stuck out the rear more than the rudder post almost 1/16". I uncovered just the back face enough to sand it down so that the rudder could mount flush to the fuse without rubbing on that piece. The only good news is that Oracover can be removed and restuck- the color and the glue are separate.
If you wanna be picky and know what you want in a fin (no, not a Finn), you may want to look at the rudder alignment, too as in my post yesterday. I knocked ~1.5 degrees effective right rudder out of the fin- i.e the fin pointed to the left in front. That pocket was kinda tight anyway. I just filled the remaining gap with epoxy that had microballoons mixed into it so that it wasn't too runny and didn't weigh too much. I used the same mixture to fill the gap between stab and its slot, then even smeared a little on the rudder base/fuse joints. Ended up looking pretty good because the filler is white like the fuse.
Good luck with the rest. Once the stab was on, and the fin slot straightened, it got to be kind of fun, mount servos, gear, engine and tank. I did find the firewall is cut for right thrust, but their mount seems to take it out, ...magic? I ended up about 0 down, 0 right first try. Flew great- no dive or balloon on power changes.
My personal choice is to never shock the rudder servo (anymore) so I put a nice Sullivan tailwheel mount on- now the wheel is sprung softer vertically and also goes thru a spring to the rudder- no shock on the servo. It also bolts on quicker- no slots to cut into the rudder- just a tiny hole for the steering spring to glue into. I planted some balsa once because of a stripped servo- had it all tailheavy trying to learn flat spins and it went into a death spiral as I slowed for landing because the rudder was at 40 degrees. It was acting funny before the flight and I gave it a push and then it seemed to be working but the gear was probably stripped- confidence in a plane leads to its death!

OK, its still a b-t-h ahead, but well worth it, so I offer advice with words of encouragement!!
Maybe its and ARDUC, not an ARF after all:
Almost
Ready to
Drive
U
Crazy!