@zlone - I use Silver plated Copper Sonarquest from Ebay
They grip like a vice
SonarQuest C25-Ag(T) Aluminum Alloy CRYO AG Silver Plated Audio Grade IEC AC Power Plug Connector
When you compare them to other plugs you wil see that the clamping contacts are much thicker
These are the best IEC’s I have ever used in over 10 years of making my own cables
Also, you might be interested in a couple of my other posts...
I have tried many other brands, but Sonar Quest are the best mains connectors I have used and they are affordable
Regards - Steve