You're welcome. First I tried a cross-cut file but it was too much work so I purchased a belt rotary sander with a about an 80 weight paper. It worked really well and I could get a flat close to 90 degree surface just by eye-balling it. Here are two links to videos I made actually sailing on this new design. I have been very pleased with its performance -- I can jibe and tack almost at will. It is a simple matter to depower the wing in gusts, and crashes are quite low consequence because I am so close to the ground -- less distance to fall. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-g-Hn2ghvbA8.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-LjyufCGpB84.html
I have several videos where I use the wing on my ice boat. Here are two: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-LjyufCGpB84.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-g-Hn2ghvbA8.html The new design features foot-steering which works really well. I can tack and gybe almost at will. The skates are ground to a point (90 degrees)) along the whole length of the angle iron. The old design had fixed hockey skate blades (which were not ground to a point) but left as they were for hockey skating -- To steer that design I had to move the Center of Effort of the wing forward and backward of the Center of Lateral Resistance on the ice boat to steer down and upwind. While that design did work, the hockey skates -- flat on the ice -- tended to lose purchase and I would spin out in high wind on hard polished ice. Hope that helps :) Good luck mate.
