Another system for thru-deck mounting uses a pair of specially designed Mounting Flanges.Edson's 978-35-6B Base Flange Mount for 3-1/2" Radar Mast has a shoulder to support the bottom of the mast, along with using Edson's bored 978-35-6D Deck Flange Mount for 3-1/2" Radar Masts (sold separately) the mast will pass straight through the deck of your boat securing the Radar Mast in place. Edson suggests that large washers or backing plates be used when securing these Flanges to the deck or hull structures.
