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Evostar 72? What flattener do you have? Apparently the "Correct" flattener is actually the one for the ED80. And they have a design issue. The ED72 has a female drawtube thread and the rest of them male, at the moment the only way to connect the two is a 2" screw in nose on the flattener but without modifying the compression fitting that screws in to the drawtube you wont get it to come to focus with the correct spacing.
I am in the process of getting a male 54 to male 56mm adapter made that will allow all threaded connection to eliminate the tilt that the compression fitting and nose results in. And it will increase my backfocus too. With the compression fitting modified in mine (Shortened by 4mm) I have about 1mm focuser travel left!
Apparently there is an official skywatcher adapter coming soon, but I am a bit concered they might be too thick from the photo I have seen, which means a choice between achieving focus and getting the spacing right. Time will tell. If they are thin enough I will probably buy one as they include a facility to rotate the camera.
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