This is my first instructable so do enjoy.
Step 1: Materials
You need a street address for the nice people at ClearTec to deliver for free sample of plastic mailing tubes.
For insertion into the pencil recepticle.
For making the incision in the pencil tube cap.
Step 2: Order your Tubes
The tubes should come in a week or two. Mine came in a nice box with a letter from the sales rep.