I installed a 3-wire power jack a few days ago. It just barely fits, but that is OK because only a small bit of aluminum needs to be cut around the old 2-wire cord strain relief bushing hole. I do it with a Dremel in about five minutes. The solder lugs on the back also make it easy to install a couple of EMI Type X2 .022uf 250 VAC capacitors between the AC lines.