Product review (5 stars): Fit nicely on my elderly Tappan Electric Range
The clock knob on my Tappan Electric Range reached the end of its useful life.  The center "spring" had come loose from the rest of the knob and, hence, I could no longer set the timer or change the clock unless I used an external tool like pliers!  This item fit the clock stem perfectly and I can once again set the timer and adjust the clock with ease.

What I'm going to do with the TWO extra knobs isn't too much of a concern since the shipping was quick and the price was reasonable.  I suspect the new knob will outlast the range.