To sum it up like mike-Inkslingers said alot of builders etc are doing exact copys of machines, coil makers included.Which is pretty fucked up for the original guy that invested his time and money in to it.I had done a long post on this about the bishop and its clip/slider etc over a year ago on here.I do think when you use someones idea you should have to pay them a percent if you are making money off it(common practice in the music industry if you sample etc.