After trying the glitch about 3-4 times, I have found two ways of using this glitch...
Option 1:
Go through the bottom door near the centrifuge then up through Juggernog to the spot. Here you will have to enter the glitch from the "front" by going DOWN the staircase until you can lay down. Then once you can lay down, stand up and face the doorway toward the Stakeout. To use this option you cannot open the MP5k door, or the fire trap door under M-16. The zombies will pile up next behind the door frame. Zombies coming out of the ground will also go straight to the door from the area near the MP5k. However, if another player attracts the zombies too close to the glitcher, then they can still hit them. The window in the back ALWAYS needs to be guarded, because the zombies will go straight to the glitcher from there. I like this idea more because the other guy only has to watch one window in a 2 player game. You can use this for 3-4 people too with 2 guys at the door, one at the window, and one near the MP5k door.
Option 2:
Go through the upper door near the centrifuge then through the MP5k door. Go into the glitch normally by going UP the staircase and hitting the wall. Have any other players watch the two windows behind the glitcher by the Stakeout shotgun. To use this option you cannot open the door from the Stakeout shotgun to the power or the door to Juggernog. This also works well however, zombies will come to the glitcher's right from the window. These can hit the glitcher and result in his quick demise. This option will give additional players a better view on the zombie horde, however the glitcher and his teammates need to be alert to the guys from the right.
I hope this helps you guys figure out new ways of using this glitch, and if anyone doesn't understand what I am talking about in this post, just message me and I can help you as best as I can.