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I got to thinking about this, and though the HRCC can be held in the newly-modified focuser top ring (as in the 3rd photo), the length of the HRCC barrel supported this way will be small. Adding a heavy eyepiece could cause the HRCC and eyepiece to tilt off axis.
If the 2" adapter is used, the HRCC is supported along a much longer section of "tube", and while this doesn't get the maximum in travel, it may support the HRCC and eyepiece better.
After all, the modification made to the focuser ring shows a substantial in-travel was gained between picture 1 and picture 2.
Sorry my comment was 6 months later, but i was thinking about coma correctors and remembered this thread.
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