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You then have to rivet the 30 back on
Why? It's just done for convenience - the lower level cassettes are just stacked up sprockets with plastic spacers. If it's on an alloy carrier then yes, it's a totally different ballgame but I don't believe the HG-500 is... (crosses fingers, hopes he's right)
edit: this youtube video
shows the reverse side of a cs-hg500-10 11-34
hamrack
gbj_tester
That's the easy bit. You then have to rivet the 30 back on and rebate the spider to bring the stack down to the desired width.