the cone is fairly blunt you could easily make one by using a stainless steel bolt of the correct size and welding on top of it with stainless welding rods to form the cone, the finer tip is really just so the mast will rotate, my Nacra 18 square is 11ft wide the width makes it more stable but on a 5.5 with two people I wonder if you need the extra righting moment as that makes you much slower if you don't fly a hull, great project keep us in the loop