Sonar Mast Shim

Shimming your mast under the leading edge will trim the board nose up and help enable you to regain a more comfortable stance and control over the board at higher speeds. Shimming the mast under the trailing edge will trim the board nose-down at lower speeds (e.g., pump, dockstart, or downwind), helping the foil to engage foil sooner. NOTE: North boards and foils are designed to work together for their intended discipline without the need for shimming. However, the Mast shim can be useful when mixing different brands of board and foil or using a given board or foil in conditions outside of those it was designed for. 

Install from front to trim the board more nose-up

Install from back to trim the board more nose-down

1.0° Mast Shim

Designed to fit industry standard foil mounts 165x90mm

Stackable - when stacking multiple Shims use longer front or rear screws (M8x33mm Screw pack E)

With North boards the Shim will work with existing M8x30mm or M8x25mm (Scoop Mini) DropBox Screws

Outline shape designed to match Sonar HM Mast Baseplate