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I can't recall the thread, I did measure it but the bloke making the adapter for me had just finished making one for someone else and had checked that it fitted properly, so I asked for "One just like that please"
No matter which way you slice it though, the decision to use a different drawtube thread in the ED72 focuser compared to the 80 and 100 which use the same drawtube OD is a monumental cock up on Skywatchers part. All they needed to do was simplify their stock lines and use the same drawtube and the ED72 would fit all the same adapters as it's bigger brother. The irony being that the two speed crawford is much nicer to use than the single speed that the ED80 gets!
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