[Spike-A-Pike]

I just have to think that adding a vent in the furthest parts of a mold and applying just enough vacuum to draw the plastic to that void has to be safer than forcing a liquid under pressure with air needing to be forced out to make room for the plastic. Sort of like a hydraulic ram that still has air that needs to be bled out so the air pressure won't force the ram to extend once fluid pressure is removed. Oh well...