We are aware that some ATX PSUs feature an additional frame that spaces the screw mounting holes further away from the feet, making the BC1 screws too short to reach them.  Presumably, this has been added to reduce noise/vibration but it does stray from the ATX standard and making longer screws to ensure compatibility would lead to problems with other PSUs and hardware. Fortunately, there is a workaround using our PSU spacer screws that extend the mounting holes beyond this frame and allows the PSU to be fitted to the BC1. This