Hi Ben, Thank you for this. I’m not at all handy but thought to give this a go, so I ordered the impeller and fixed the grinder. Its working so well now that I have a new problem, and hopefully someone has a solution. The ground coffee shoots out of the chute and goes all over the place, well outside the bounds of the removable bit that is supposed to catch the small amount that goes beyond the portafilter. It wastes really good quality coffee, and makes a huge mess all over the countertop. Any suggestions? Thanks, Scott