I had that large diagonal prism+enclosure collecting dust.. so I convert it to fit to C11 back end and to accept Celestron diagonal.. for more convenient adjustment to avoid awkward twisting of my neck during visual sessions...
Works OK.
Some time ago I ordered from Ebay this SCT ring.. it arrived today.
For ~$12 and and a little bit of machining (2" thread cut off and the inner diameter enlarged to ø44.5mm), I have second eyepiece adapter (the first one I am using as per original setup and for my turret (post #20).
