Maybe it could be in my new book...
"I am DIY, and so can you!"
Step 1: Extract the cord from the case.
WARNING: Please aim for the plastic on the pouch and not at any other person. The cuter can be fatal to anything the blade happens to touch. Please do not aim at any part of the body with any intent to use on one's self. I am not responsible for the lose of any appendage caused by use of this sharp tool.
No gut around the small white nub that protrudes from the case.
Then cut the nub off the cord(just pull it off).
Now, cur the hole bigger and pull the straight pug through the bag and out the zipper.
The real problem with the case is that use of it causes any formed plastic edge to tear. This is what happened right next to the zippers on mine. The plastic tore and sort of ruined the water proof factor.
I don't have pictures because mine was falling apart, so just look at the end result.