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You mean someone SELLS them? I cobbled them up out of sheet brass...not particularly happy with them but they look OK.
Tim Horton encouraged me to add some pics of my completed fourth level of my nolix .... you'd almost think I planned it that way...lol:
Seen helices built with threaded rods, but using threaded bolts for bridge base is brilliant!(or, it is in concept until I mangle it in practice!)...