For Windex 10 in or 15 in, the J-Base by Davis will allow for side, top or front mounting on most masts for big boats and dinghies alike. This J-Base comes standard with the Windex 10 in. Sport, but can be used as a lighter weight option for Windex 15.
J-Base is made of glass-filled polycarbonate, 2 in. (5 cm) long. Includes stainless steel set screw and (2) #10 self-tapping screws. Reduces overall weight by 15 grams when substituted for standard mounting base on Windex 15.