Shimano special tool TL-FC16.
http://techdocs.shimano.com/media/te...9830616000.pdf
The parts list calls it a "fixing bolt", but it's really more of a dust cap and it's not on there tight. You should be able to get it loose with some thin-lipped pliers if you don't mind a little marring.
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Last edited by DMF; 05-25-08 at 11:13 PM.