Mahlkonig EK43 Replacement Sheer Plate Ensure the smooth functioning of your grinder motor with the Mahlkonig EK43 replacement sheer plate. These plates are intelligently designed to break under load, providing crucial protection to the grinder motor. Originally intended to break in the event of a rock jamming the burrs, these plates now serve the essential function of safeguarding the grinder motor from damage caused by the start/stop action of EK43's used for espresso rather than retail coffee. .