You'll need one "electronic" component, and a few tools:
A subminiature SPST three-position switch. My lab has a drawer full of C&K 7203 switches
, which is actually SPDT. For a slimmer SPST version, order the C&K 7103 (pictured) for a few bucks from Mouser, Allied, DigiKey, Jameco, or your favorite distributor. This switch has three positions -- the middle one is open-circuit, just what we want for blessed silence.
Triangular screw bits. Our mobile's case has some, really weird "security" screws with triangular recessions in the caps. I ordered a set of four bits from McMaster-Carr Industrial Supply
(items 5941A11 through 5941A14).
A soldering iron, solder and flux. You will need to know how to solder