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Thanks for the replies guys!
Not sure i'm game to do the dismantling & reassemble.. maybe! Believe this unit has already been modified to focus past infinity at least - the barrel rotates about 50mm past the infinity mark. Wondering if this would give enough backfocus to fit some kind of micro-focus device between scope & still allow a dslr camera mount?
Think that's likely a large part of the problem - having difficulty focusing using the main barrel focus, simply because as you touch it there's a great deal of wobble even on a sturdy tripod and heavy geared head. Might also try a Bahtinov mask - which would at least give a clearer indication of focus. Bojan - I also noticed that focus seemed to be easier to achieve from right to left, but didn't think about the cause being thread backlash, but makes sense!
Could also be the design issues mentioned though, with the mirror mounting causing stresses.. more testing required i think.
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