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hi there Paul
that image looks pretty darn good I think if you are having any issues with collimation it will be the top secondary cage being not braced enough since my mod on my 10" version I have diminished 99% of the flexure in the front cage and when I point the scope in any direction in the sky it seems to hold collimation very well I have also added compression springs under the secondary mirror adjustment screws which make it a lot more precise in adjustment
cheers Pete
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