Not a "new concept". Cam clamps have been around for at least 40 years Cam Clamp - StewMac Cam clamps are a favorite of all types of woodworkers and they come in very handy in lutherie as well. We offer high-quality clamps in two sizes. www.stewmac.com If you are doing these for lutherie work, spool clamps are very effective, too. And a lot faster to make and a lot cheaper, too.