Step 3: Finishing Up
Take the male headphone jacks and install them on each cable. I won't go through instructions on how to do that, since there's plenty of resources available online.
I used heat shrink to not only protect the connected cable by securing it snugly in the connectors outer shield but to also denote which connector is left vs right.
Once that's done, you're good to go!
NOTE: After over a year of use, one of my ear pieces started to fall apart. I had not glued it back in place and did not want to. To fix the problem, I used a post-it note to create a shim to tighten up the two pieces of the ear piece. I ripped the non-sticky part of the note off and stuck the sticky side to the inside portion of the ear piece. I put two pieces on it like this, and now it's tight as can be. I think using electrical tape would be a better option (if a bit too thick), but I only had office supplies on hand.