Shimano Cassette Lockring and a funny little washer

El Zomba
El Zomba Posts: 164
edited November 2012 in Workshop
I've just got hold of some nice new wheels (thanks Shutuplegs!) and have bought a new cassette to fit on them. Looking at the pieces, I've encountered something I've never come across before: the lockring has a very thin metal washer screwed on to it. Seeing as I've never seen this before, I'm wondering if this is meant to stay on, or if it's meant to come off before putting the lockring on.

Anyone able to enlighten me on this?

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