3" diameter? Surely you exaggerate.
You don't say where you are, but if its an IEC connector those are only a little over 1". Probably a 1.25" hole will suffice. Or maybe you're trying to run several through just one hole and left out that little detail. Which happens a lot. Asking questions with sketchy partial inaccurate and/or irrelevant background information I mean.
Still, buying power cables based on diameter, got to be worth points for originality. So, given that we know sound quality is no longer the main focus why not simply unscrew the connector from one end, slide the cable through, and re-attach the connector?
You don't say where you are, but if its an IEC connector those are only a little over 1". Probably a 1.25" hole will suffice. Or maybe you're trying to run several through just one hole and left out that little detail. Which happens a lot. Asking questions with sketchy partial inaccurate and/or irrelevant background information I mean.
Still, buying power cables based on diameter, got to be worth points for originality. So, given that we know sound quality is no longer the main focus why not simply unscrew the connector from one end, slide the cable through, and re-attach the connector?