Rubbing plate/gasket retainer for the RS Quest centerboard case. Used on the under (water) side of the RS Quest centerboard case to secure the centerboard gasket. Helps to stabilize the daggerboard. Secured outward of the centerboard gasket using 6x screws. Part numbers for the gasket and screws are L2K-HF-303 and FIX-S8-C03, respectively.