North Sonar Stabilizer Shim KitLet's get to tuning! If you feel like your foil's holding you back a bit with certain disciplines, but you have the right wings for what you're doing, shimming is the answer. The 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