I hate throwing away an otherwise perfectly functional things, just because one part fails.
When the timer of my Oster toaster oven died, it's perfect time to do some hacking.
If your wind-up timer wouldn't DING either, this is for you !
Step 1: Remove timer switch
Open up the oven. Check that it has only 2 wires connected to the switch.
Pull knob off from the front and remove any housing screws.