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Fella's, Ive had this problem with my 10" hand crafted Newt. It was a real headspin but I managed to get around it. It is dual purpose for visual and photograpghy(not an astrograph which will possibly happen if you move the primary mirror). I solved it by two actions. 1st- I unbolted the rack&pinion focuser and inserted it from the inside of the OTA which effectively brought it closer to the mirror by 15mm.
2nd- I ground down the outer flange on both my 2" and 1.25" adaptors which enabled them to travel further into the focuser tube allowing up to 7mm closer to the mirror(this was time consuming using a dremel a grinder and a metal file). In total 22mm closer to the prime mirror therefore enabling prime focus with my canon 60D. I know it may seem extreme but It worked for me albeit a butchered set of adaptors and a rough and ready look to the scope. But hey there not meant to look pretty sittin in the lounge room anyway...
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