I fabbed up a pair of mast gates as described someplace using hardware store door threshold strips and fitted them to the mast. The problem surfaced that the thickness of the aluminum is significantly less than that of the mast track edges causing the sail slugs to bind going up or down when they transitioned between the two. I tried gluding on some thin HDPE plastic strips to the gates to even out the thickness, but no good. Does anybody have any other ideas? Do the stainless steel gates eliminate this problem?