Is this a gynocologist joke?
Actually, the trick is to tie string to all the pots before you take the nuts off, then you can pull them back into their respective holes after your modifications.
I have been toying with the idea of adding a master volume to my Epiphone ES-295. I like the middle position sound and get the perfect balance dialed in between the rhythm/lead volumes. But then I don't have the ability to back off a little for the verses like I can with my stratty guitars. I noticed that the gretsch's have that master volume thing and that would be useful to me. Fishing a string through a non-existing hole should also be lots of fun.