Voltage limiter - help needed

The little round can thing is a noise suppression capasitor. It prevents a pop noise in radio speakers generated by the mechanical limiters. A solid state regulator doesn't make a pop noise.
The DeMonIVR regulator was designed specifly for this instrument panel/ application and is the only one that will mount right where the noise cap' is removed using that same screw.
NOTE to the powers that be, No I didn't just advertise/promote myself. DeMonIVR now belongs to Instrument Specialties Incorporated.