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Well guys, another three more on the way. One is on its way to Canada!
Just a bit more information. Rather than threading the end of the extension, I tap the end with the same thread as used in the existing counterweight bar (usually 6mm). The joint between the extension and the existing bar is then via a steel bolt rather than aluminium. A couple of people were concerned that aluminium would not be strong enough. I hope this just clears up any concerns.
The only other dimensions I need is the diameter of the existing bar, they seem to vary betweeen 16 and 18mm, and the length, most have been 200mm. Much longer than this may put excessive strain on the joining bolt.
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