Steve, as Wavy mentioned Whitworths etc stock them. Then all that is needed is to cut to the appropriate length and then either grind or turn down on a lathe part of the threaded section.
Wavy, quite true, they are fine for very light loads but with the TOA + AZEQ6+ counterweights, finder, diagonal, binoviewers and eyepieces the load is approaching 50Kg, far too much for the stock tripod.
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