I just read to little scotch may cause sighing.   

I'll have to go pour myself a glass tonight, now.

If you had used scotch tape on the knob it wouldn't have fallen off

He's right you know- a tad of Scotch tape on the shaft under the knob (easy boys!) and the knob would be a press- fit on the shaft. And really, which of us does not want such a fit?

Brian

If you had used scotch tape on the knob it wouldn't have fallen off