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 !
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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.
Step 2: Replace With My $1 Hack
Get any light switch and connect with existing wires.
Step 3: Expand Hole for Light Switch
I use my zip saw, but dremel will work too.
Just any rectangular shape will do
Step 4: Reassemble Everything Again
Put a little hot glue if the switch is not stable against the housing.
In my case, the wires are pretty stiff as is.
Now it's really manual operation, just WATCH the food like a hawk !