Victa Lawnmower - Fitting New Blades

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Replacing the blades on a Victa Villager 1997 model 2-stroke motor lawnmower, and replacing the spark-plug as well. Disclaimer: I am a Victa owner, not a Victa expert; I'm not even a mechanic. I live a long way from any service centre, so I've had to learn how to service and replace things myself. I am happy to share my discoveries, but cannot guarantee that what I do is right way to do it, nor if it will work for others.