thats a bummer. i've got the same scope and luckily haven't had your issue... was there a noticeable time at which it started rotating - what caused it?
i know its not ideal but it looks like you could limp through the roar and deal with it afterwards - as the rotating cuff you are having the issue with is just marking the centre of the tube it might not be that hard to find the centre by looking down the length of the scope and hold it in place and shift the top dial with the other hand? of course this is far from ideal, but i bet you've spent a fair bit of time sorting your rifle to dial to longer ranges with that specific scope
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