just junk??

[aa battery]

Warden found this.

 

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[AKiwi]

depends on the thickness..... but I would guess at it being the end of a type of split pin that lawyers used for joining legal papers together..... but then.....

 

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[woody50]

Burr wheel from a pepper grinder?

Great guess, I think you are right. Not too large, my peper grinder here has a larger wheel!

 

[thepoolguy]

it adjusted things for angle or height ...used on alot of farm equipment as well..pic of an application here but not exact.

 

[Bigcypresshunter]

could be a brake part.