UL Listed Charger Fit for HP ProBook 640 G1 Notebook PC Laptop Power Supply Adapter Cord

hello well as regular viewers all know I'm primarily concerned with audio and video technology but I do sometimes do some things to do with other aspects of electronics and so it is today this is a power supply for an HP laptop and it belongs to my son and I've got a similar laptop of a similar age which has almost the same power supply but is a half a volt greater voltage now this one we have a problem that it became all unreliable you plug it in and have to keep wiggling and jiggling it to get it to power the laptop and you could blame the laptop power socket but that wasn't the case because my power supply albeit an extra half a volt work the laptop just fine and we've been using it for several weeks that way but I have now got a replacement cable so this is the DC connector which I need to fit into there now think about these DC power jacks is you assume you know it's got ground and