I bought a second hand Les Paul that had these fitted. At first, I asked whether the dude still had the original parts: boy, was I wrong. The button can easily hold your guitar 'as is', but by just clipping on the lock, your axe is completely secured. That's right; you don't even have to screw in the strap. Clipping on is super-easy, and in my humble opinion, these strap locks look cool and snazzy. I highly recommend them; and I now have them installed on 11 guitars.