Hi Michael, I'm guessing the scope in question is the Sky Rover? I purchased the matching FF/R with my 115 and I found it impossible to use with my optical train as the physical size of reducer itself would foul on my OAG, thus I could never get the required back-focus set right. In the end I purchased the M63 Riccardi reducer from Teleskop Express and it has worked flawlessly. I'd consider looking into other options, depending on what your imaging with.
Cheers
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