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Move the primary mirror up a tad over 50mm
or
get a new (low profile) focusor that will allow you to rack in the required distance.
You didn't say how tall the focusor is when fully racked in.
Maybe you could post a picture of your focusor and the adapter so we can all see, the above are what I do. My 10" f4.66 newt is being rebuilt to take into account a new low profile crayford, and a Esyguider with a DSLR or SLR on the business end of it.
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