One option is what was done for me: install the header bar frame assembly and hang the frame on the pivot bar in winter, then crank it up until ice-out. Mine was done late March a year and a half ago. It's a 6x30 aluminum frame, in one piece. It was delivered by pickup truck/trailer over the ice. Two guys carried it from the trailer in to shore, for hanging on the header bar after it was mounted. Having solid, level ice made delivery and mounting easier than if there were no ice. They had to wait until mid-April for the ice to melt around the dock before they could attach the legs and set height, and then it was cranked up again to await the rest of ice-out. Before the legs were on, I climbed out on the frame, supported by just the cable. Boy, that thing is torsionally rigid.
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