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I can measure this evening
Place the assembled control head in various locations to determine the bestmounting location with the following requirements:-a stable, protected surface to protect the control head from excessive waveshock, vibration, and water-sufficient space for the control head tilt range-visibility during operation, as well as easy installation and removal-access above and below the mounting surface to pass the cables through to the control head-space for the 1" (25 mm) cable hole, under the bracket or 2" to 4" (50to 100 mm) behind the chosen mounting location
sorry got busy building ice rods....I'll get the dimensions up today
I bought a ram mount for my helix 5 and on the description from ram's website is "The RAM-202-153-202U consists of a round 2.5" diameter round base (Universal AMPs Hole Pattern), double socket arm and 1.5" x 3" rectangular base.The rectangular base contains four holes with a center to center pattern of 1" x 2.5". For most applications, mount will support up to ten pounds." It fits perfectly. https://www.rammount.com/part/RAM-202-153-202U