loose IEC power cord connection?

I have used Teflon tape wrapped around the IEC.

ozzy

Exactly what @ozzy said! Doing that for many years with great results...

Wig 😁

yeah... first avoid Wattgate connectors. They tend to fail to seat fully so you always have wiggle room.

If the male connector has only 2 pins consider adding a ground pin but do not connect it internally. This will increase the grip 50%. Lastly, yes, Teflon or even just electrical tape can help reduce the clearance and therefore the wiggle between the male and female connections.

On the wall socket side, use at least commercial/residential (both together) outlets for grip strength, and add steel gaskets if the wings against the drywall have any play at all or sink when pushed.  The sockets on the wall should be rigid.

Here, in the wall connection, I’ve found Leviton hospital grade, 90 degree plugs to be superb.

C20 Contact Retention Insert for connecting a C20 into a C19 Black (cables.com)

IEC320 Male Over-Mold Contact Retention Inserts - Secure Sleeve Tab For Plugs (cables.com)