Step 2: The Monitor (ahh! danger)
TAKING APART A CRT MONITOR CAN GIVE YOU AN ELECTRICAL SHOCK EVEN WHEN THE MONITOR IS NOT PLUGGED IN!!
First, read these articles again http://www.highdisplay.com/how-to-take-apart-a-computer-monitor/ and http://www.instructables.com/id/How_to_safely_disassemble_a_CRT_monitor/.
Unscrew the side speakers if your monitor has them, and put them aside. Look on the back and bottom of the monitor for any screws and unscrew them.
Open the monitor by lifting the back half of the case. This may take some prying and snapping but its ok. I found lifting the back case and hitting the top seam with my hand released the front and back halves of the case.
Unscrew the four screws in each corner on the inside of the front of the monitor case that holds the screen in. Unsnap any metal snaps that might be on the sides.
Take out the monitor screen and any electronics so that you are left with just the casing. You should be able to just pick the whole thing up and pull it out. DO NOT touch the wire or rubber booth connected to the monitor. MAKE SURE you have read the articles about disassembling the monitor.
You should now be left with just the plastic casing. Take out any foam, plastic, or rubber pieces that may be stuck to the casing.
Use the drill and circle cutter to make a hole near the bottom of the monitor so the gerbil can crawl out. Sand both sides and vacuum up the mess.
Cut a piece of plexi 1/2" larger than the size of the screen opening. Hot glue it to the inside of the case
Cut another small piece of plexi that will cover the holes where the cords in the back used to come out. Hot glue that on the back. *see picture
Fill the case with the stuffing, and screw the case back together.