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I Hope you are right, the scope is up at the observatory and I will give it another run once we get clear skies again - you may be right - after reading that thread and a couple of others I backed off the secondary screws a full turn and did the same to the primary screws - then I did a collimation with a Tak Collimating scope. The screws were tight and by tight I mean tight - you would think that they had been put in with an impact wrench. I had to use a fair bit of force to get them started with a T-Bar hex key. Depending on what the outcome is I may crack the back and check the clips. Just to confuse the issue I will attach a 10 sec Bin 1 x 1 image take further outside focus - the triangular shap is still evident even though the interior of the donut is round.
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