Product review (5 stars): Product as Described
The black knob broke off of my wife's KitchenAid Artisan (KSM150) lock lever. After reviewing a parts diagram I found online I felt this was the correct part but the previous reviews made me doubt myself. Since it less than $5 I went ahead and purchased it. It was the correct part exactly as described. The issue is that when you open your mixer you will notice the metal bar it is attached to is crimped to make sure it does not fall off. Ideally they would just sell both pieces together. I don't fault the seller for this.

If you take a good pair of pliers and work the teeth back and forth against the crimped metal it smooths out allowing you to remove the broken lever and replace it. Afterwards you need to find a way to secure the metal bar again. I took a hammer and smashed the tip enough to be sure the lever would not fall off. I was careful not to been the bar itself.

Not a perfect solution but once it is all back together no one can tell.