What is wrong with the locking switch on the #20? I think it works great.
The switch design as a whole is the pits. However, I removed the locking portion because as you use the device, the switch turns and may cause it to be in the lock position when you are trying to use it.
Also, the "roughness" that folks are noticing with the button is the return spring binding on the side wall of the switch housing.
I may remove mine yet again and place a very small piece of shrink tubing or something in there to smooth things up.
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