The boys from Watermark repaired the crib dock next door and used a similar arrangement, but it was more like a long piece of pipe with a foot. They stood the pipe straight up in the water and put a come-a-long in the top of the pipe then wrapped a piece of chain around the dock frame connected to the hook end. A few clicks and the dock frame lifted-up a bit so they could work on the top of the crib. I think they use the same poles for adjusting pipe docks. They might sell them or the welding shop in the same building could probably make you one. Good luck.
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