and support the sleeve 117 plate 81 and platen 72 when the platen has been retracted to the position shown in fig8 the pin 116 forms a part of the piston rod and the interior piston is mounted within the actuator housing 119 which defines an interior chamber for hydraulic fluid under pressure provided by a suitable valve at a suitable pressure to form a fixed downward stop for the platen against movement beyond the position shown in fig8 the stop actuators 115 will prevent downward movement against the forces generated by the stripping actuators 95 in other words unless the hydraulic fluid under pressure is released from the housing 119 the lower platen 72 cannot retract more than the position which is generally shown in fig8 the pins 116 in particular the main cylindrical body portion shown positively locate the bearing plate 81 in relation to the hydrostatic bearings and actuator 75 and even though the slot 110 has some clearance relative to the rail 108 the lower bolster 72 and lower mold half 31 remain properly positioned during the time when the upper mold half 30 and crosshead 20 are retracted thus it can be seen that the rigid platen 72 is suppoted directly by the actuators 75 which provide the molding force through the hydrostatic bearing plate 81 to the platen 72 additionally the stripping actuators 95 provide a short load path between the upper mold half 30 through the rigid crosshead.