It seems you have clearly established its to do with the corrector.
But it may be that the threads on the corrector are not orthogonal.
Stephen Buda has done work for others fixing out of square threads.
It may be better to open up a communication with him and see if he will remachine the threads on your corrector and fix them up.
Whose to say if you get a new corrector you simply get the same problem?
Greg.
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