Pin in hole . Probably worked better when new , there's some slop now in the pivot holes . Sometimes tends to climb when dragging backwards . There are also two sleeves with holes on the back side at the ends , look like they were maybe for some kind of slider or something to prevent gouging say when plowing snow .
We see them all the time up here on mower units . The sides of some of these roads is pretty steep , they run a mower deck on a boom and need balance weights .
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