You slide the nose of the T-Ring into into it....
Ohhh, nevermind - I forgot you were doing it on an SCT: different hookup to the back of the scope.
On my dob, you have the Ring adapter that goes onto the camera body, that in turn screws into a 1.25" adapter that you slide into the barlow which you then slide into the focuser.
My bad - I forgot that SCT's use a different setup for visual vs photo work.
G'Luck!!!
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