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Cliff,
Welcome to the world of the Powermate/ Telecentric extender.
The quick answer is that the spacing of the eyepiece/ camera BEHIND the PM is of no real consequence. The magnification changes very little.
The PM will need to be placed slightly inward if the backfocus changes dramatically.
So, whether you use a diagonal, spacer etc AFTER the PM doesn't do much to the optical path.
HTH
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