G'day
I don't have the same scope as you but do have a etx125. The thread on the back of you scope looks like it is a similar size. What I did was buy an adaptor from scopetronics in the US which screwed onto the original thread whilst having the standard SCT thread on the outside. This allows me to attach SCT accessories as well as a 2" visual back. Problem you have is the diameter of the baffle tube which is not quite big enough to fully utilise 2" diagonals etc.
Mark
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