Hmmm, I will try and decipher your shorthand
, the adapter has an SCT thread on one end for the SCT collar on the Flip Mirror and is 2" OD to slide inside a 2" focuser barrel.
I used it to slide into the 2" focuser of the SW ED80 when I was using the Flkip Mirror to get guidestars for the ST-4.
Cheers