Mine isn't staked, and my 45s don't have that plug machined out, just a hole in the casting machined for the head of the rod.
If you put 5 lb/ft of torque on the screw it creates half a ton of pressure per square inch, not 60 lbs. I checked mine one time with a 50 in/lb torque wrench and couldn't get it to turn against cool 50/50 lube when maxed out, so it takes something more like 2000 psi to get the lube to flow if it isn't at least 60-70 degrees. So yeah, no wonder they leak. Actually, my 45s don't leak, just my 450 with the plug, some lubes I've used softened the o-ring.
Yeah, Walter, that would 'splain the blowout.