Steve Austin said:The spacers are just plastic. If you want to sacrifice them, thats your filthy business.
you know what i mean
i'll have a look at the cassette anyway with a view to dremmelling it. hadn't thought of that, thanks for the suggestion. I had assumed they were 'just one block', rather than separate sprockets riveted together with spacers in between.
coincidentally i bought a new dremel grinding bit today. I actually dremmelled out the seat stay cable stops on my mtb to take full length outer from the back of the top tube all the way to the mech.