Can I easily change the hammers in a hammer mill?

It is easy to change the hammers in a hammer mill. The housing of the hammer mill has openings where the hammer shafts can be slid in and out. The large mills also have a rotor lock so that the rotor can be locked at each hammer axis. Switching is then easy; a hammer shaft is pushed through the unused opening of the hammers. Then the other hammer shaft is pulled out of the used hole. The hammers are thus reversed and can now grind with the unused side.