Product review (5 stars): which ridges are wearing out here?
Prior to purchasing this replacement knob, please determine whether its the knob's ridges or the timer assembly's ridges that are wearing down. I have just placed my second replacement knob order, but the real issue is with the ridges on the timer assembly that the knob's ridges connects with. Those are the ones that are wearing down. and those can't be replaced as simply as a new knob. On Amazon here, the timer assembly as a whole is $120. Be wary and purchase the right part.