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Not on a BR-6600/6700, the bolt goes in from the back and is locked by a grub screw in that threaded hole, plus an orthogonal one in the top of the arm.
http://bike.shimano.com.sg/media/techdocs/content/cycle/EV/bikecomponents/BR/EV-BR-6700-2921C_v1_m56577569830753782.pdf
gbj_tester
@Clockwise
@fussballclub on the right the threaded bit should have a bolt in it?