Well there you go, that's what I get for ordering all my equipment in one hit as opposed to getting it bit by bit and seeing how it (should) all fit together
Don't worry, I'm not planning on pulling the eyepiece apart! Guess I'll grab some 1.25" filters and find a good home for the one I have. I spose every cloud has a silver lining... 1.25" filters are cheaper than 2" ones so I'll be better off if/when I grab some nebula filters!
Thanks for the replies guys
Edit: scratch that, because 1.25" filters won't fit on a 21mm Ethos when I get it. I'll have to look into getting that barrel extender!