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The counterweight shaft diameter for ALL Paramounts from the original GT-1100 in 1998 to the MX today is 1.5 inches. Software Bisque sell 20lb counterweights. PlaneWave Instruments sell 40lb counterweights. You'll often find used counterweights for a lower cost on Astromart. They're stainless steel, so they keep well over the years needing only a little touch-up with Naval Jelly perhaps once in ten years even if left outside to the elements. (Don't ask how I know this.)
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