My goodness Paul,
It sounds like you are having an Everest of a time each time with one of these instruments. Well done in persevering and not giving up until perfection can be achieved. Most people would have given up a long time ago and called it quits whilst going mad in the process.
You could easily set up a telescope tuning business with all your success in this area!
Hope all ends well with this scope.
John K.
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