Ok a mercury switch is freaking amazing!The first bass I bought, a Hagstrom HII back in the 60's, comes with a Muteswitch on the top of the pick guard. I found it SO valuable, I put them in EVERY bass i bought since then. You can set it down without feedback or noise or mute it during rehearsals so you don't make noise while talking or whatever, and you don't lose your settings!
If it is a really nice bass I don't drill a hole. For my Lakland, I put in a volume pot with push-pull switch. for my Hofner, I changed the useless solo switch to Mute (1 jumper) and for my 5-string P, I added a mercury switch across the output jack that mutes the bass when it it turned vertical. Works GREAT and I don't even have the think about it. Put it on the stand - its OFF.
ALL basses should have Mute switches. Period.
If you shook it would it stutter? Cause that's right where my brain went.
Also I like to throw around my basses on stage so maybe encapsulate it in foam, Hmmm....
Can you still buy a mercury switch?