Check that the blade boss is not loose on the shaft (key sheared). If ok, replace the spring washer under the bolt head.
FYI - at the factory, they put non-hardening thread-lock on the bolt. Clean off the grease, make sure that it's clean, but dry, then use Loctite or similar.
Make sure it's the NON-HARDENING type. Get this wrong, and you might as well weld it on!
phil_saunders(a)bigfoot.com
Phil Saunders
May 2012
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