North Sonar board adapterNorth Sonar board adapter The Sonar Foil System is connected to the board by a lightweight CNC machined aluminium Board Adaptor with a tapered geometry locking connection that engages with the mast. Fusing Board Adaptor and mast together to build one union for optimum load transfer and a stronger, more direct feeling and steering impulse when foiling. Incorporates a strong geometry locking connection for a more direct feel. Fits all boards with
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