In reply to a query by Shipwreck, I'll clarify what I mean by a duplicate thread.
A duplicate thread is one which appears after a thread has already been started, say ST4923. The 2nd thread is a duplicate thread and is totally unnecessary, all queries should be posted in the existing ST4923 thread.
An individual thread does not apply to a particular clue, it applies to ALL clues and queries for that one crossword.
I hope this clarifies things.