That is interesting Bob.. Mine has those 2 catches at the front of the canopy and is supposed to have 2 bolts at the back. I glued magnets at the back so my canopy is easy to remove quickly. My stab is at 0 to the canopy rails and the wing has -0.5 degrees,(trailing edge up). That is how it came out from the factory. Of course the tail has an airfoil and the fuselage mounting pad is flat. I shaped my pad to match the foil and be at 0 to the canopy rails. Mine flies flat with no down elevator and requires almost no down push when inverted. I do like the spoileron trick for landing on a windy day. I mistakenly took off once with the spoilerons up. I could hardly notice the difference.