fixed using a plastic compression fitting including an internally threaded collar 140 and an externally threaded connector 150 the length of the pole assembly 40 is locked by rotating and tightening internally threaded collar 140 onto externally threaded connector 150 with reference to fig6 the pole assembly 40 includes an upper end 160 with a cap 170 fixed thereto the cap 170 carries a circular connector 180 that couples the upper end 160 to the upper corners 80 90 through a carabiner 190 although the connection of the upper end 160 of the pole assembly 40 is shown as including a cap 170 a circular connector 180 and a carabiner 190 in alternative embodiments the connection may include one or more of these connector elements or one or more different connector elements with reference to fig8 the pole assembly 40 includes a lower end 200 with a cap 210 fixed thereto spaced above the cap 210 is a stop 220 with circular lip circumferentially and longitudinally fixed to the circumference of the lower pole member 130 the high strength strap or connector 60 is made of 1 in nylon webbing rated at 600 lb breaking strength and is connected at one end portion to.