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Seaview radar mast mount
I''ve installed a Furuno radar on my mizzen mast but the same would apply to any mast, I guess.
I used a spare halyard to hold the mount at the location I wanted and a couple of bar clamps to hold it tight to the mast. Using a level I got it clamped into the position I wanted then marked the holes in the mast for the fasteners. I used 1/4-20 SS machine screws (three per side) with holes drilled and tapped. To prevent electrolytic corrosion I used Tef-Gel (Ultra Safety Systems) on the screws since the mast and mount are aluminum.
When you consider the movement of the mast while underway you don''t have to be too concerned about getting it ''exactly'' level. And I think you will find there is an adjustment inside the radome for any athwartship alignment that is needed.