The book "Guitar Players Repair Guide" by Dan Earlewine covers the installation of a hipshot bender. Just like Ninja said... Fender installed them on their Nashville Tele's... I believe the HipShot brand name comes specifically from that piece of equipment. Since then HipShot has went on to make other parts for guitars but they're most well known for those first HipShots... you can check out Hipshotproducts.com for their whole line-up of internal and external HipShots... also check out their other gadgets...