Something sharp e.g, needle (I'm using the sharp end of a compass)
A leatherman/needle nose pliers.
That's it for the tools!
Step 1: Stabbing With Sharp Thing
Step 2: Squishing the Pencil
Squishing is simple, get the pencil and put it on to the ridged edges of the pliers, as shown the picture below. Then squeeeezzzzeeee! When you get the pencil out there should be little ridges where you squeezed. Do this all around the pencil covering all of the surface area. If it is hard for you to squeeze you can use a softer pencil or soak the current one in water for a little and poke it around so that water gets in the wood..
If you used the soaking trick, leave it in the sun or put it under the Torch (Just kidding) or a heat lamp.
Step 3: All Done!!!
P.S. Can someone post a diagram in the comments of how you wire up a full wave rectifier/ where the ac in is and the dc out? Please?