The Manta Load Plate Adapter is made for avoiding destruction of the board due to the large lateral forces acting on the fin box in a windsurf-board.

The load plate distributes the load evenly on a larger area around the fin box. 

How you want to look your gear like after a WindFoiling session (with the load plate)

How you do not want to look your gear like (no load plate, heavy impact)

These customers had an ancient Windsurfing board with a power box fin box. They also had a small inflatable with 10hp engine. Rather than buying a new board or doing major alterations to it, we were able to fit them out with a Mantafoils SUP XL wing and Power Box Head and Special Load Plate and like magic they can Fly!