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I had the same problem on two of my reflectors reaching focus with the MPCC. With my Saxon 8" f6 I replaced the rack and pinion focuser with a low profile 10:1 Crayford and on my Skywatcher 8' f5 which came with a crayford I simply bought some longer mirror cell screws from Bunnings, I think they where 40mm long 1/4 BSW to bring the mirror further up the tube without cutting anything and only took about 45 min with collimation.
Simple easy and totally reversable if need be.
Cheers Daniel.
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