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3) While tightening the blade assembly can be held fast by inserting a wrench or the screwdriver supplied into the cap and gearcase holes; to do this, rotate the cap until the two holes align. NB. Only use blades or nylon string heads marked with a maximum speed of at least 10.500 min-1. For instructions to replace the nylon string please refer to illustrations N1-5 in the front of this manual. G. ENGINE/SHAFT ASSEMBLY A DANGER. Do not run engine without shaft attached as clutch could fly off. 1