Copper Sleeve over IEC

About a year ago on another thread, I told of removing the ferrous cover on my ac mains box. That made for a nice improvement and heard by others in my listening room as my system was being played. Tom

I have looked at the forum site where this tweak was first reported. I was interested in the idea of outlet cover material improving the sound. From what I read, brass outlet covers did not make a difference, but carbon fiber added to a plastic cover or the expensive commercial covers did make a small improvement.
David Pritchard

David my last post was in reference to removing the entire cover off the AC mains breaker box. Tom

Chrissan,
I just talked to 1 electrical engineering at my work and, just like you brought it up earlier, he too rec'd to run a ground wire from a coupler to the classis. Verified.
He thinks to design a "metal hat" like Marantz do to their REference lines to shield up the entire transformer is not a bad idea...

Brought my EIC connector in local Ace hardware for sizing but their biggest size avail. for copper coupler was half inch or 3/8". Does any one have the part number from Lowes of Home Depot?