This is a bell blade support, also known as a bell spacer, for your lawn mower. It is fitted between the bottom of the blade, and the blade bolt. This part provides support for the blade. It is made of metal to ensure a long life. If there is visible damage or wear, replace this part.
Installation Instructions
Michael from Lillian, AL says,
Blade became warped over time, baffle was falling down
In order to change the blade in a push mower you need to use a 2x4 or equivalent to stop the blade from spinning. I bent the blade back previously by heating it up but I think it was causing too much...read more