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possible alternative
Kevin,
I wonder whether you can find out what is going on by removing the nosepiece/T ring temporarily and focussing by eye on a reasonably bright, crisp image (e.g. the moon, street light) using each eyepiece in turn. In each case, then replace your eye with a sheet of white paper and move it back and forth until the image is clean. That might give you a rough idea of how far the focal plane is behind the EP in each case, and you can go from there.
Cheers,
Andrew
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