This is where the rubber meets the road, or rather the uPVC the water. With the angle section (which am not convinced we need) applied to the inside edge of each sponson we clamp the ski in place, with the bevelled edge of the skirting-board set toward the outside edge of the catamaran.
Because of this ~ 'til I call the manufacturer to complain that their skirting-boards are endangering lives at sea by having only one bevelled edge ~ I have had to mark them 'left' and 'right'.
Disgraceful.