Not really a direct response to your post, but I got a counterweight extension bar made by one of the members here and it was certainly a helluva lot cheaper than that. Aluminium shaft, well made and fit like a glove. It was originally for my HEQ5Pro mount, then when I sold that for a EQ6 I modified the extension bar (with peter_4059's help, ok he did it all) to suit the bigger diameter threads.
You have mentioned a 1" shaft though. That's non-standard, isn't it? But I'm sure there's plenty of guys here who could knock one up cheaper than that.
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