A charcoal chimney needs to have holes in it to function properly. Over time, though, it can develop Additional Holes which are not helpful. And when you start to think it might be wise to renew your tetanus booster after using it, it might be wise to invest in a new charcoal chimney.
Kudos to Weber for the one screw that can be removed to take off the plastic handle, then the rest of it is recyclable metal.