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Before you attack the adaptor, ask a friendly machinist. The older the machinist the better I find, as they are normally more inclined to assist.
What I think you want is something that will either fit tightly into the focuser tube, or screw into the focuser tube. On the end of that you need a thread, M42x0.75 I believe, the standard T thread. So you can then simply screw your T ring to this, and have it virtually touching the top of the focuser.
Make sense?
Gary
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