The other thread that David talks of is the crash of my lightning at markham Park, nothing to do with structural failure of any kind, but to those who are interested . my tailplane was undamaged in the crash, so since i have little left i thought i would remove the skin and take a look inside , which I did , firstly even though I had sliced through the skin surface with a dremel and cut off tool, the skin was extremely difficult to prise off the structure underneath, , there was a quarter inch wide seam of resin glue on every square inch of structure, ribs formers etc, underneath the main long mounting bolt is a thick, resin coated balsa block, which prevents one from compressing the tailplane by overtightening the mounting bolts and weakening the structure there ..... every nook and cranny was lined with the same resin glue and although the stablisiser was very light it was also immensly strong... the weakest point is obviously the slot cut into the under surface for the arm to exit.. once this aperture is cut, then the only way to replace the strength is to glass cloth the inside through the servo mounting.... HERE ARE SOME PICTURES , LETS SEE WHAT YOU ALL THINK