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The ebay item I purchased was a combined T-ring and a 2" t-adaptor. They were supplied in a single box, but unassembled. When I first screwed them together, it was rough and jammed in the middle, but with some insistent pressure, I eventually got the adaptor bedded to the t-ring.
I then unscrewed the t-adaptor to try and put the coma corrector on the t-ring. Given it should have had a similar thread and also jammed, I assume it it the t-ring itself that is bad. I only managed to get a $5 rebate from the supplier, as they wanted me to post it back to china for a full refund, which of course it would have cost a fortune to send back. It's still usable if I don't want to use the coma corrector but use the 2" adaptor, so I'm OK with that, but obviously useless for my primary purpose at this stage, unless some lubrication helps, which I will try with some PJ and the cheap adaptor to see if it actually makes any difference or not, before proceeding further.
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