loose IEC power cord connection?

If anyone is concerned about the lack of contact inside the IEC female plug, One can insert strips of material under the metal inside the plug.
So the metal box in the female plug is slightly pushed in (mainly near each center face) so the plug makes a more solid contact.
It may also make the plug much harder to push in.
I would use stiff paper, rather than wire, just to keep the chance of a loose wire coming out from under the sleeve and shorting the plug.

Best method I found was fitting a piece of black heat-shrink tubing over the IEC plug.

Black "electricians" tape is all you need. It's so bloody easy...just wrap a couple turns.

Nothing applied to the outside of the IEC plug does a thing to improve its connectivity. Just keeps it from falling out.

I think not falling out would help the connectivity everytime;^]