Do you have the washers that go on the blade holding screws?

If you have the Blade 24" you would need the below. 4237 958 0500 - Washer - https://www.lsengineers.co.uk/catalog/product/view/id/25272 However if you have the Blade 18" you would need the below. 9298 003 3540 - Washer - https://www.lsengineers.co.uk/catalog/product/view/id/40258