Thanks Alexander. I did make myself the canister tool as well and I think that is where it all went pear shaped! I may have been totally happy in my ignorance thinking I had all spot on.
I will keep the focuser in mind but I guess that the star test will be the decider. Although knowing myself I will still have that little niggle in the back of my mind knowing that everything may not be "perfect" even if the star test is fine.
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