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Hi Leo,
No, the baffle, which btw is a simple one piece aluminium tube threaded at the mirror end, screws onto the top of the small mirror retaining ring which you can see at the bottom of the tube.
The small mirror retaining ring sits above the mirror and is threaded to the mirror adjustment collar shown in the front view of the 'Back plate less mirror' pic. The mirror slides over the white teflon washers, then the retaining ring is screwed down and two small hex screws lock to the adjustment collar. The baffle is then screwed on to the second top thread of the retaining ring. This also retains the mirror in position once hand tightened.
I'll attach some pics of the mirror retaining arrangement. No light leakage there, but since the new decoupler will sit just outside the periphery of the backplate mirror adjustment plate, there could be some potential for leakage there, but it will be a consideration factor in the design. Pic #4 shows the light path from the baffle to the imaging train. The new decoupler will separate the imaging train from the mirror adjustment plate thread.
Cheers,
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