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Yes Leon, they are exactly the same scopes from the same factory, just painted and branded differently for different customers (Orion, Saxon, Skywatcher).
It isn't good that you recieved the wrong brand and color though, when you specified one in particular.
Yes, the focusers are interchangeable between the brands and sizes. Even the ED80 and ED100 focuses are interchangeable. My ED80 has an ED100 focuser.
The tension screw should not grip on until fully screwed out, so that is a bit of a worry. It should get less and less grip as the adjuster is unscrewed.
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