My knob just spins on my timer dial.
I removed it and compared it to your pictures - I don't see anything broken.
Could it be something else?
Answer Hello Rick! There are threads inside the timer knob 3948416 to screw the knob onto the timer shaft part number 3951769. You'll need to inspect both parts and replace the item with the defective threads. Thanks.
How do I remove the timer knob?
Answer Hello yonko. The timer knob 3948416 unscrews off the timer.