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Well the spacers have one or two with sided flanges and are designed to fit a certain way-if they're out of sequence or reversed you don't really notice but they're not sitting flush to the base of the cog so that would be my first port of call before getting an Evans mechanic onto it. Either way you want the small cog sitting tight to the freehub or else you might strip the lockring threads.
Welcome to the cassette, I'll dig it out of my heaving parts bin for pics but might not be able to get to a post office till later in the week tho.
I'll have that cassette anyway, ta muchly. I took it to the LBS as I didn't have the right tool and they said it didn't fit. However after carefully putting it back on by hand I was able to get the final sprocket to just grip, and then tightened the lockring by hand and its gripping now and not slipping, even without any torque. Annoyed the LBS made a pig's ear of it and sent me away feeling like a muppet. There's an Evans around the corner, going to pop it in there tomorrow, get them to check and tighten it.
Phew, thought I was taking crazy pills there for a minute