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Have you tried to push it back on? If you did, does it now fit real loose??
When you put it back on is the knob just kind of loose? Do you have a pair of pliars so you can pull the stem out to start the dryer?
I want to know if it slides in and out as it should or if its sticking.
It will turn, but not pull out even with pliers
Ok, thats why the knob came off. You dont need a knob, you need a new knob assymbley. This is a combo switch that works both the timer and the starting of the machine.
You need to have this replaced. How old is the machine??
Lets put it this way, you looking at around a $225 to $275 repair. Lowes has a washer on sale right now for $350.00
With the washer that old, I would suggest getting a new washer rather than repair the old one. if you repair the old one, your going to spend $250 to repair it and still have a 12 year old washer thts going to break again sooner rather than later.
I hope this helps answer your question, if so please click the green accept button, if not im still here to assist you.