Gday might be a long shot but just seeing if anyone has a Takahashi pier adapter for a EM-200 mount and would know the size of a tube it could connect up to plus how its connected {attached a pic of what it looks like }
I made mine from a large piece of aluminium. As usual the Tak one looks great but I guess it wouldn't be cheap. Maybe the Aust importer knows if not ask the guys at www.takahashiamerica.com
I am guessing the pole diameter would be in the order of 100mm - 110mm. Mine is 114 but of course is custom made so not really relevant to this thread.
Thanks Monte .....found some tech drawings from the net to make a custom one, just waiting for some feedback from a supplier about the Tak adapter to see which path to take