I recently acquired a very funky and very beaten up'78 Stingray. At some point the mutes had been removed, but the screws where present. I got a replacement set from Ernie Ball UK* and installed them today. First I loosened all the strings a lot, then I removed the two hex screws that hold the bridge in place and the mute-screws. Then I lifted the bridge and carefully put the mutes in position Put on the screws And done! Like new I actually got two sets, one for my 1979 fretless Stingray too: it had the mutes, but they were all dried up and not functional (I know I could have juste replaced the foam, but I wanted to keep the old mutes original just in case). * getting the mutes shipped to Norway was a complete hassle! Ernie Ball UK only ships to the UK and the Norwegian distributor had no idea of what I was talking about... In the end I had the mutes shipped to a friend in Brighton who then sent them to me. I mean come on! Totally unnecessary... it's the Internet age, ship internationally already!