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m11,
It's been a long time since I used a #1209 focuser.....
I had to consult the Operating Instructions!
When I used it I generally also used the SCT adaptor to fit the diagonal/ flip mirror/ spectrograph.
This adaptor has an alignment groove and the two retaining screws register onto a pretty deep groove to lock the adaptor flange to the rear of the Microfocuser.
Based on this experience I'd suggest going down the SCT thread route and use a 2" SCT diagonal etc.
Hope this helps.
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