The pic shows the original and the replacement bolt i found. I tried putting a washer on the new bolt but the bolt and the washer must have come off whilst i was using the mower. Not sure though if this is a star washer. It's just a regular washer with a round whole.

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IMG_2201.JPG (267.7 KB, 9 downloads)
IMG_2202.JPG (256.01 KB, 9 downloads)