I rivetted an eyestrap right at the masthead and spliced up a 2' (or so) leash for a TiLite airblock. At the point where the lower loop of the leash hangs, I drilled holes through the walls of the luff track at the back of the mast, and ran another piece of Spectra around the mast and through the lower loop on the leash. The eyestrap takes the vertical load, and the loop transfers the horizontal component of the load to the aft portion of the mast, eliminating any tendency for the kite to reduce rotation. I can take pictures if you like.