Elimination of play between rolls 13 and main bearings 12 in a non-forming area and forming of material to be formed in a forming area are repeated while play between a housing 10 for the rolls 13 and main bearing axle boxes 11 is always eliminated. In a preferred embodiment of the invention, the elastomeric cover is immovably sandwiched between an outlet face plate and an electrical receptacle and the box to which the receptacle is secured. Equalization is expedited by recycling received training data through the equalizer more than once during a VSB data field after a field sync segment is detected. Detection is made as to an intensity of a reflected laser beam which results from reflection of the forward laser beam by the optical disc. The hollow conductor has a closed end on the downstream side of the flow of insulating gas and has a cylindrical barrel portion provided with a plurality of opening. Additionally, the FM receiver produces an output voltage indicative of the radio frequency channel in response to detecting the signal.