On my mower deck, there is a bracket with 2 tensioner pulleys attached. The bracket has a lot of play in it, it wobbles pretty bad. There is some sort of a cap with a rubber seal on top of the shaft that I think somehow has to be removed in order to get to the bolt/nut holding the bracket to the post. I have never seen one of these kinds of caps before, and before I destroy it trying to get it off, I was wondering if anyone had seen or used one of these before.
Here is a link to the schematic: