Ensure that the mower has been switched off and that all moving parts have come to a stop before carrying out any work on the blades. The mower must be parked on a flat level surface with the brake engaged. Always wear heavy gloves when working with the blades. Raise the mower to its maximum height and begin unfastening the blade bolt by slowly unscrewing it in the counter-clockwise direction. Sharpen both ends of the blade equally, ensuring that you keep balancing it to check for uniformity. If the blade is damaged and needs to be replaced, install the new blade within the shaft and fasten it securely by installing the blade bolt and turning clockwise.