A knuckle pin retainer for a railroad car coupler adapted for disposition in an aperture formed by a knuckle coupler assembly for connecting adjacent railroad car. The material includes hydrogen peroxide. In addition, there are provided well-defined b-stageable adhesives useful in stacked die assemblies. Such arrangement desirably enhances the reliability of the liquid crystal device. Other comparators and methods are provided. By virtue of the setting of a radial gap formed between a brushing edge of a blade profile and a guide face lying opposite this, in which setting a guide ring forming the guide face can be acted upon with a coolant, the hot-starting behavior can be improved, in that the guide ring is cooled before the start of the machine.