Allan,
I've got a 10" GSO dob on an EQ6 - no problem. I think the GSO has a larger diameter OTA than the Skywatcher (bigger gap around the mirror) and from what I've seen the secondary mirror cell is different. I think the skywatcher has the secondary glued to the holder whereas the GSO is held in a cell so the mirror can be removed (an cleaned if necessary).
Peter
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