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Leon, for any visual work on the FSQ-106N you will need the Extender-Q x1.6. Have you got this? The reason why you need this is there is insufficient back focus in its native F/5 mode.
The new FSQ-106ED does not require the Extender-Q x1.6 as the new design has increased the back focus by 178mm. This is sufficient to use with bino viewers etc.
You can pick up the extender-Q x1.6 from AEC for $400.
Another thing to consider is can you reach focus by removing the diagonal and simply inserting the eyepiece only. You will be viewing at an awkward angle, but reducing the back focus required. In fact, many Japanese observers don't use diagonals at all. They simply insert the eyepiece they want to use.
Indeed, everything screws onto the FSQ. This makes for a much firmer coupling of accessories compared to using set screws or compression rings. These are prone to expansion and can make equipment such as camers etc loose in their fitting or worse case fall out onto the floor.
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