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Trev,
I think you are missing the point re: spring pressure on a mirror cell.
Sure the GSOs etc have got it wrong with the springs.
But all that is needed is a spring that holds the mirror firm at the setting
of the collimation adjustment. A very firm spring.
Any typical four stroke valve spring does the job.
Zero movement due to mirror weight.
I don't know what eyepiece and focuser have to do with any of that?
Surely that is an issue of what you intend the telescope to do...planetary
(barlows, EP) or deep sky ( focal reducers etc) , each requiring a
completely different focuser range.
regards,
Steve B.
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