You can buy shims, Shimano make them (seriously) and they're practically invisible when installed. I'm pretty sure I got mine from my friendly LBS, it's worth asking around as it's the sort of thing bike shops will have left over in their workshops.
@Booga started
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You can buy shims, Shimano make them (seriously) and they're practically invisible when installed. I'm pretty sure I got mine from my friendly LBS, it's worth asking around as it's the sort of thing bike shops will have left over in their workshops.