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I just measured the safety screw out of my HEQ5 and it is M12 X 1.75P , The standard 12 millimetre metric course thread.
Also checked my EQ6 Pro and it is the same, though I do recall that the older EQ6 Safety Screw was only 6mm X 1.0 P.
That was measured with Vernier calipers and thread gauges so about as accurate as you need to be.
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