These appear to be the only fix for faulty Variax units, but it is hard to find information on how to install them. The installation is a bit tricky, and you need to have the Variax workbench software and interface in order to reduce the string volumes. Ghost saddles appear to have much higher output than the originals, so string volumes need to be reduced by around 60% to avoid an overloaded, distorted sound. After some tweaking, I am now very pleased with my improved sound. Time will tell how they stand up to gigging.