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@Smallfurry
Damn I hates admitting this....
but I have 2mm of those exact spacers on my Bob Jackson (fecking asymmetric BB, grrrr). Just wack on the 2.5mm spacer, then the sprocket, and then the lockring. Be sure you're happy with the amount you are able to screw on the lockring, as this will now be 2.5mm less than before. I can tell you that this is a safe set-up on an ambrosio hub (system-X etc.), but you'll have to suck it and see with yours.