I needed to replace the #5 knife blade for my KitchenAid meat grinder attachment since I lost the one that originally came with the grinder. When I installed the blade, I noticed that its square opening was slightly larger than the shaft it mounts on. When I operated the grinder, the grinder assembly cogged back and forth that I had not witnessed in the past with the original blade. I measured the blade and opening size so I know I have the correct size blade. It's either poor quality control or the designer did not use the correct dimensions. Either way I now have to live with its flaw.
Owner Response: Hi Ed, We're sorry to hear about your inconvenience. LEM grinder knives and plates are manufactured specifically to work with LEM Big Bite Grinders. They are made to industry-standard specifications and will fit most, but not all, standard grinders in the market. If you're not happy with the product, we do offer a 30-day money back guarantee (please refer to the packing slip that came with the product). I would also suggest contacting KitchenAid directly for an exact replacement knife if you are not happy with the fit or performance of the LEM knife. Thanks for your feedback. David