A sliding member held by a movable case is interposed between the movable case and a stopper plate. Dealcoholization reaction takes place between the carboxylic acid group and the alkoxysilyl group in the structure to induce intramolecular crosslinking. 1 to 10 wt %, and an amount of the at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent added is 0. The pawl is moved from engagement with the piston upon fluid under pressure being delivered to one end of the cylinder. These areas of weakness can comprise areas of reduced thickness or radial extensions that extend towards the perimeter of the fastener retaining portion. The moveable includes a spring tab.