Enhanced protocols and devices may be used to alleviate loss of spectrum efficiency in wideband transmission. The product silicone-containing copolycarbonates have lower haze values than similarly constituted copolycarbonates prepared by other methods. The transmission assembly is rotated by the motor, and the screwdriver is attached to the transmission assembly. As a result, a preassembled unit that can be manipulated easily before insertion into the pump housing is obtained in a simple way.