Insert bare stranded wire, tighten screw.
I really dislike these types of connections. In my experience the set screw needs to be retightened often, the copper gets all oxidized, the screws can loosen up and the wires fall out. Yesterda...
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All I can say is thank goodness you can't buy aluminum wire in Canada anymore. I don't have any in my RV, so that is another blessing.
