An adjustable top mount is disclosed including an adjustable head adapted to receive an arm adapter, the adjustable head having teeth separated by spaces, the arm adapter having a support tube adapted to receive an outrigger boom, a knob assembly operatively engaged to the adjustable head, wherein the knob assembly releasably secures the arm adapter in a position of a plurality of positions, a baseplate operatively engaged to the adjustable head, and a tapered pin slidably positioned within a portion of the baseplate, the tapered pin releasably engaged to the teeth and releasably movably positioned in a space of the spaces.