"Very odd when they supplied both piece though and they still don’t mate. The listing said m42 x 0.75"
You unscrewed the nose piece from the t adapter, so those parts were fitting ok? but then had trouble screwing in the comma corrector? I was thinking that the corrector and t mount threads were not compatible. Find out which has the bad thread and get a replacement, a lot of places don't even want the old one sent back.
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