Agree with Ian, my EZ brackets are snug. They require a big of wiggling to remove and install. Very little play and no shaking with my Leatherworks bags.
Greybeard is right regarding the dimpling of the brackets. The dimples can and probably will wear/deform with time. Simply redimple to take up the play in the machined grove on the pins(if that can be done??). That should take up the slack rather than trying to use some kind of washer...
