I have ‘78 Heresys and have always used just bare wire under the screws. Twist the wire so you have a tight straight end. Wrap the wire around the screw clockwise. As you tighten the screw it will pull the wire under it. If you wrap it counter clockwise it will push the wire out from under the screw. I bought these speakers new in ‘78 and I’ve never had a problem with bad connections. I could use spade ends but if it works, don’t fix it. Sent from my iPhone using Tapatalk