I was able to pull wires too. I switched everything to LEDs so the current
draw is minimal. I could have used 22 gauge, but that is pretty small and
"fragile." So I used 18 gauge and that went easily. The original wiring
looks like 16 gauge. What I did was to first pull tag lines through (by
attaching some nylon string to the original wires -- this is the kind of
string used to lay out plots. Mine is yellow and is available in any big
hardware or box store). When I then pull the wires through I first wrap the
wire with a little tape, then I tape the string to the tape on the wire,
that way there is better grab. I sometimes pull a second tag line along
with them. That way if I ever want to pull a second wire or if I lose the
first line when pulling, I am all set. I usually just leave the second
string in there, who knows what I might want to pull in a year!!