To be an open A-frame type to allow flexing under repeated load shocks.  Total height not to exceed 7 ft. from mounting plate to top of pedestal/main boom connection point.
Swing post to be single piece high strength solid steel (ASTM 4140) turning in (ASTM-D4020-81) cast nylon bearings. Welded spindle/head assembly is to be stress relieved prior to installation.

Main boom to be comprised of two 4 in. x 8 in. x 3/8 in. thick high tensile steel tubes connected to each other only at their center line to allow a shock absorbing flexing action of the boom.