Review on 🔧 TJPoto Replacement Part - Set of 2 Lock Lever and Speed Control Knobs in Black for KitchenAid Stand Mixer by Kenneth Barnes

I bought 2 sets of these parts - one for my blender and one for my son's blender. Both mixers required interchangeable speed controls. One of the knobs worked on one mixer, but when I tried to put another knob on the second mixer it didn't fit. I don't know if the lever sizes are different or if one of the slots for the second change pin is smaller than the other. I don't want to unfairly downgrade a seller if the problem is with different size blenders. .I hope I can get both to work.