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Capt, for the center pivit I would use a pipe of copper, brass or PVC just a little smaller then the width of the bridge for stability. Then take another pipe that would be larger that would slide over it for more of a bushing fitting. Find pipe that may have a flange for the op and bottom pipes for easy attcahment to the base and bridge. I would make sure the fit between the two pipes has a little play, maybe enough for some white lithioum grease. This setup would be for manual operation. Use a ballcatch found in the door hardware section of home depot and such places, they are used on the top of a double set of doors to keep them closed. <br /> There is a product called scratch coat found at stucco supply houses they use for covering styrofoam with using a fiberglass me***hat builders use to simulate limestone window sills and such. Around here a 60lb bag is $24.00. I Always thought this would be a good product for garden structures. <br /> <br />I'm interested in your feedback of my idea!
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