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May I suggest you take that shot with a fine ruler next to the threaded connector. What exactly is the width of the threaded end and can you measure the pitch or gauge of the thread (in 5mm how man times does it loop around * 5 = US thread sizes - likely to be 8 or 10 gauge).
Richard might want to do the same with the connector of his focuser to see if it looks in the ball park.
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