Thanks for the quick response, Peter. At this stage, it looks like I'm going to go without a nosepiece, which also makes the focus point easier. I could squeeze on a nosepiece + T adaptor, etc, but gets a little complicated, and I have to get the special DSI T adaptor from Scopestuff.
I noticed after removing the DSI filter slide box that the 2" adaptor flange sits just inside the ring of four screw holes that held the filter box. I am going to make up four little clips and basically clamp the flange directly to the face of the DSI, then I can screw it into the back of the scope tube quite easily (your thread works great).
If my approach works, I'll then dab some epoxy as well on the tabs where they contact the flange, so they will become firmly affixed in case I ever want to remove it from the DSI.
I have the flat UV filter from my DSI III OSC which I was thinking of using, as I use a regular glass one with it now.
I'll post some pics when it's done, probably mid week.
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