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Hello @graham5
Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about your lawnmower.
In order for us to provide you with more information, can you please post a photo of the model tag of your mower. We can then track down the owner's manual and find out for you how to replace the blades on your mower.
If you need further assistance, please let us know.
Eric
