Now you are ready to put base on recepacle box w/counterbalance.
1. Insert wires thru punchout and line up screws with pre-drilled holes...

2. add lock washer and nut; tighten...

3. Pic of base w/counter balance assembled, and other components for lighting projects(other receptacles for cfl's)...12 guage wire...the size of the wire is important; the ballast had 12g wire in and out and you shouldn't splice into smaller guage wire and plug it in...IMHO