Rancilio Rocky Grinder Dome Cover Bean Rejector, Mark I

The Rancilio Rocky is one of the better (well built but not insanely pricey) upscale home espresso grinders on the market. It has at least one flaw, however: in the hopper is a dome-shaped plastic cap that helps guide beans into the grinder while protecting against the insane (attempting to insert fingers into hopper and grinding teeth while operating). This dome cap is screwed in with 3 screws which also hold the hopper itself atop the top half of the adjustable burr grinder hardware, so thes