Remove engine oil
Tip mower on side with the exhaust side down.
Remove plug lead
Obtain 14mm socket or spanner.
If you don't have a blade locking tool, put on a hefty pair of boots. Squat down and place right boot to the right side of the blade (with the blade in the 6.00 o'clock position)
Place socket or spanner to blade bolt head and turn anti-clockwise.
Remove blade
Replacement is a reversal of the removal sequence.
(dont forget to refill the oil)
pleasant, May 2010