ORIGINAL: falconhob
re the missing 12mm tubes, if you're going to put in gator or similar wing adjusters, then the ones that go in the wings become surplus. You can then sand and join them to use as the stab spar tube in the fuse. Re the fin, I split it along the seam a the top and gently moved and reglued it. Also ditched the factory tail post (heavy) and stripped off the front of the rudder and replaced it with balsa so I could use "normal" hinges. With the MK tail wheel, the rearmost hole is great for doing trianulation measurements for the wings with one of Sam Turner's KISS wing alingment devices. Had to move the right side 30mm hole back about 2mm for correct measurement.
Just another set of data points on the Impact.
How did you strip off the front of the rudder? Do you have any pics at all? I've been toying with building a totally new rudder but if it is easy to cut off the front and replace it with balsa then I'm all for that instead...