loose IEC power cord connection?

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;^]

If one looki=s into the A/C connection from a wall receptical to an A/C plug.. One can see the connection between the two parts is a rather small area of contact.
The IEC connection is a rather large area of contact, as much as twenty times the area of contact. So.. if it is not making solid contact over 80% of the surface, it STILL is a better connection than a standard American A/C connection.

Okay, but put a Furutech IEC connector on your power cord and I'll bet you can hear the difference :-)

This is assuming that you can do this without miswiring, electrocuting yourself, burning the place down, or otherwise wishing you hadn't.