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
Pull knob off from the front and remove any housing screws.
Step 3: Expand hole for light switch
Just any rectangular shape will do
Step 4: Reassemble everything again
In my case, the wires are pretty stiff as is.
Now it's really manual operation, just WATCH the food like a hawk !