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@dubtap
Heres the Shimano tech doc for that hub, the 10mm allen key fits into part 11 on the exploded view.
http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/FH/EV-FH-RM30-8S-2388B_v1_m56577569830800934.pdf
New freewheel is pretty cheap if it does turn out to be borked.
http://www.petracycles.co.uk/shimano-spares-fh-rm30-speed-complete-freehub-body-p-6017.html