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There's two reasons to have a spacer on the splines of the freehub body, behind the cassette. One is due to freehub design, some hub brands require a spacer behind all cassettes regardless of cog count (Mavic comes to mind. The other reason (and why Shimano sometimes needs a spacer) is to end up with enough cassette and spacer "width" to allow the lock ring to fully tighten down without bottoming out on the freehub's end (which will result in the cogs remaining slightly loose).
One needs to make sure that both the cassette cogs are fully tightened against each other, and the freehub body's inner end, and that the small cog's splines have engaged the freehub's. All without ending up with either der cage/spoke contact or chain/seat stay end contact. Andy
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