North Sonar Stabilizer Shim KitThe rear Stabilizers main role is to maintain a level and stable flight path. But conditions and user preference may change what stabilizer angle feels the best (aka the sweet spot). Shimming changes the angle of attack (AOA) and controls the amount of downforce the stabilizer creates on the overall foil system to increase the stabilizer AOA and front foot pressure, add positive shim. The smallest tweak in the AOA can improve comfort, reduce fatigue,