Review on Enhance Your Rabbit and Houdini Corkscrews with Metrokane Replacement Worm - 2 Spirals! by Chad Chavez

Picture note: two top screws replaced, bottom screw original. As far as I can tell, it can't be Metrokane. The original has a steel pin set into a flange that is flush with the top of the pin. The replacement purchased has a hex bolt protruding from the washer. The extra height prevents the cap from screwing in properly, which keeps the "worm" in place. So it falls off easily and I would expect the threads to be snapped. Also the purchased replacement has a threaded screw unlike the original which came out after one use.