You can get some lock nuts at Your local Napa store, they look like they are damaged because they are out of round and the compression on the bolt keeps them locked in place. these are the type the auto dealers used stock. and they to are single use only.
Some of the nuts you pull from your bird if they are stock nuts will be these. I just rebuilt the control valve on mine and the nut I took of was one of the off set nuts. the one I put on from the kit was a nylock.