[Alan Anderson]

Strip the wire to the proper length.
Do not twist the wire strands together.
Turn the screw counterclockwise to open the clamp.
Insert the wire to the proper depth.
Turn the screw clockwise to tighten the clamp.
About two minutes later, tighten the screw again.
Tighten it once more the next day.

Use a screwdriver of the appropriate size, so you can apply enough torque on the screw to hold the wire securely.