The nose peice from a barlow often has the right thread to engage the T ring at the back - just unscrew the lens from the barlow.
Some 2" nose pieces have the right thread on the back - mine do.
Oh and by the way, if you hook up the adapter and actually use it, you're done for - no one ever can resist the urge to try a bit longer or a shot of the moon or a video of this or that planet. that way lies insanity and poverty
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