We have a Champion RL534 TR and we have changed the blade this morning. It is best to use a ring spanner (ours was a 14mm) and to undo you need to turn anti-clockwise. We found the nut really difficult to undo initially (not removed for 8 years) but resorted to taking it to a local lawnmower repair man who removed it with an air gun.
Hope this helps - good luck
Angela
August 2011
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