96 3 were obtained the so called 2a fraction of the wire which was outside the tolerance range owing to being non round and to the presence of roll flash amounted to 1 2 replacement of the roller guide assemblies was necessary examination of the replaced roller guide assemblies of the seventh and eighth roll stand showed that the supporting arms 5 were deformed they had to be replaced by new supporting arms 5 billets of the type specified in example 1 were also rolled out to wire with a diameter of 5 5 mm using the same roll stand train but fitted with the roller guide assemblies of fig1 and 2 in accordance with the invention the roller guide assemblies having the sensors 20 were optically adjusted and then set with a precision mandrel to an electric sensor output signal the grooved rolls of the roll stands were also set by means of precision feelers the wire produced from the first billet was dimensionally accurate and capable to be sold as a so called 1a product during the rolling process the electric sensor output signals from the roller guide assemblies of the seventh and ninth roll stands increased and this was compensated for by closing the grooved rolls of the sixth roll stand the wire of the last roll stand became.