WBT connectors are the best I've ever used, not cheap, but very very good. I think Audio Advisor sells 'em
?? best expandable banana connector
I have some older Maggies that don't have the set screw in the female connector so you can better secure the connection. I have tried Monster X terminators & found the expansion screw to break very easy. Would like something without any plastic in the construction (all metal) that would provide as good as possible surface contact. Your comments will be very much appreciated.