Another system for thru-deck mounting uses a pair of specially designed mounting flanges. The standard 2 3/8” mast uses flanges that are both 3”x5”. The deluxe flanges are 6” in diameter. The Thru-Deck flange is bored so the mast will pass straight through. The Base Flange has a shoulder to support the bottom of the mast. Edson suggests that large washers or backing plates be used when securing these flanges to the deck or hull structures.
Click Image to Zoom
Edson Mast Mounting Flange - Base Mount Small Mast