Hi Mike
I notice that the Lumicon model from My AstroShop “appears” to have a relatively short 2inch insertion length and that it also has the undercut for the grub screw(s) that locks the 2” tube in place.
The Scopestuff photo shows a longer 2” barrel and no undercut.
In my Moonlite focuser, the brass compression ring seems to just teeter on the edge of the undercut (of a different make/model adapter) and causes some wobble, so I’ve had to remove the brass compression ring and get a longer 2” barrel for some of my accessories.
Cheers
Dennis
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