well to say "it is about 42mm" is not very accurate is it? we are talking 3mm, so you need to be more precise. i have never spaced a cog out, but 3mm does sound like a lot, but you could probably get away with a 2mm spacer, 1mm diff is fuck all.
spacers available from here http://velosolo.co.uk/shoptrack.html
@deleted started
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well to say "it is about 42mm" is not very accurate is it? we are talking 3mm, so you need to be more precise. i have never spaced a cog out, but 3mm does sound like a lot, but you could probably get away with a 2mm spacer, 1mm diff is fuck all.
spacers available from here http://velosolo.co.uk/shoptrack.html