A system for recovering previously activated security profiles utilizes memory and a security application. The carcass plies are each made by sequential deposition of strip-like sections circumferentially distributed on a toroidal support. The spectral power of the output voltage at one or more frequencies is estimated, and the estimated spectral power is provided to a switch controller controlling the switches. An outer annular extension of the flexible elastomer membrane maintains the wafer at its original membrane-centered location when abrading forces are applied to the rotating wafer. The machine is further operative to output a maintenance user interface, through a rear display device.