Yea....you're probably right. I had a similar question for Celestron Tech support when I fit my ASI EAF motorized focuser to my RASA 11. They told me it was 0.75mm. It's entirely possible that they've used the same pitch on most of their scope sizes, but I wouldn't bet my life on it. I suspect if you use 0.75mm for your calcs, you're not going to be very far off....
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