I am using Armstrong foils for winging and the two A+ masts I have use a very thin EVA or Neoprene bonded to the plate.
My old Slingshot plate was bare and in fact I made a rubber gasket as the board I was using had a slight rocker across the area.
I have made polycarbonate wedge shims to get my Armstrong level on a Hypernut and am not sure if I need a gasket between the shim and the board.
Anyone done this and if so have any advice?
