As promised the tut...
List of stuff:
1. 2 part epoxy putty. I use the plumbers putty, the cheap stuff you get at your local hardware store. It's super strong and sets in about 5 min. This can be a detractor depending on what you're working on but I'm inpatient.
2. Ply-able wire, you can use copper, aluminum etc. You just need to test the stuff to make sure it does not break with repeated bending.
3. Knife, Pliers etc. I use the nifty Kershaw multi tool with vise grip.
Cut off a piece of the putty and kneed. You can use water to smooth the stuff out and prolong setting a bit.
Next, wrap the putty around the wire and...
Start makin' "snakes" like you did when you were a wee tyke playing with Play Doh.
Keep going until you reach the desired thickness. Sometimes the wire will tear the putty and stick out the side of your "snake". If this happens just start over. Bear in mind with the plumbing stuff you only have 5 min.
Once desired thickness is reached. Let the "snake" set.
Now, cut the "snake" wherever makes sense to you...
and pull the putty off the wire.
Vise grips are handy for this.
As you can see there is a nice clean tunnel which runs down the length of the putty "snake".