Quick google search resulted with this...
http://workshop-manuals.com/mini/cooper_%28r50%29/l4-1.6l_%28w10%29/engine_cooling_and_exhaust/engine/cylinder_block_assembly/harmonic_balancer_crankshaft_pulley/component_information/specifications/page_3638/
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Crashton Club Coordinator
Someone will be along to help soon. Sorry it isn't me.
In the meantime welcome to M/A.