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.
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Edson Mast Mounting Flange - Base Mount Large Mast