St. Croix Platform Mount pair used for mounting rotating St. Croix model 400 and 488 davits when they are used on suitable swim platforms. These Platform Mounts were never used.
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For an additional $150 I have if needed a St Croix Model 402SS stainless steel support kit (no longer in production to my knowledge) which mates with the model 401 platform mounts. It consists of 4 backing plate channel bars pre drilled to mate with the holes in the model 401. Each bar is 30 inches long, three inches wide and 2 inches high. 1/8 inch thick stainless metal. This is a very solid backing kit and may have other applications as well.
Both of these items were produced by St. Croix in Minneapolis a few years ago.