The bosun and a seaman were carrying out routine greasing of a mooring winch. In order to remove the dried old grease around the dog clutch and shaft, it was necessary for the seaman to extend his arm between the drum and the winch drive gear and clear it manually. With the bosun following the instructions from the seaman, the winch was being rotated intermittently, while the seaman proceeded with the task when the winch was immobile.
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