First I clip the end off at the bottom of the little circle . Top is towards the tip .
So the whole circle is cut off , easy to do with wire cutters .
The yellow innards type plugs seem work the best , some of the others will break when you go to twist the one end . The brand name is Cooper , they just came out of a bin at the HW store . Cost $1.18 ea ...
Found a couple that had the name you could read on the bottom .
Barney