Oopses, my knob was missing...

[JimGilmore]

I go to the field to hunt thins morning and was surprised to find the knob for the power missing. I was able to turn it by hand so I was able to hunt. When I got home I found the knob on my bedroom floor. I am surprised that these knobs are not locked on....
Anybody seen some better ones that lock on ?

 

[dirt lizard]

I was thinking of getting a pair from radio shack they have set screws in them