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The easiest way to get it right IMO is plate solving. I have had my gear apart entirely over the weekend and have just re assembled it all at home. It should be about 5 minutes work with plate solving to get the angle where I want it.
The problem with engraved marks to show you angles is that you have to have them on something that does not move with respect to the sky. So a frac in rings is troublesome as you can rotate everything including the scope, or my SCT which is fixed in relation to the mount but the whole image train cab be rotated in a number of different places between rear cell of the scope and the camera.
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