Originally Posted by
Concepts_Design
the side action core looks like it has a step on it, correct? If so, it has molding surface area in which case you will need to lock it by a wedge or core lock cylinder (which are garbage) Even if there was no molding surface area and you were just molding a through hole, then it's still good practice to lock it some how, wedge preferred but you could maintain hydraulic pressure on the cylinder during injection.
I personally would never have a side action that wasn't locked somehow. Since the side action core seals against steel there is the chance that flash could get in between the two and blow it back