A seat back support mechanism supports the back of a seat in a motor vehicle. A seat back including a pair of seat back extensions is provided, with each of the seat back extensions mountable on one of the seat back mounting sections. One or more discharge holes are formed on and extending through one or more specific leads andor on and extending through a predetermined position of the die paddle. , the reaction product of an alcohol with acrylonitrile, are contacted with hydrogen in the presence of a sponge cobalt catalyst. Monitoring can be periodic in nature.