Load the beans from underneath using a detachable tray with a mesh inlay which will is used to pull the beans in. (If you must go all out, put a bob that opens

Load the beans from underneath using a detachable tray with a mesh inlay which will is used to pull the beans in. (If you must go all out, put a bob that opens a trap in the bottom of the tray so they can't get the water near the machine if they try to fill the tray with it.)