DSnuts covered the re-cabling in the first post in this thread. I've been through about 400 posts already and only have about 2000 more to go before I know what other info is buried here.
You can get one of these "helpers" with alligator clips and magnifier for about $5 at hardware or electronics stores. I would not try this without one unless you have wonderful dexterity. A good pair of sharp tweezers comes in very handy for the left hand while you use the soldering iron in the right.
The soldering iron is a 25W that must be about 30 years old (not pictured). I'm planning to get a new one.
The tip is sharpened to a conical fine point with a file. The idea is just about any soldering iron will do. Everything else is well covered in the first post. I might do another cable this weekend and can fill in some steps if anyone thinks I should.
One thing to make opening the iem's easier and safer is to stick them in a ball of that "BlueStick Adhesive putty" and work the seam with a safety razor with the guarded upper edge and keep your fingers from beneath the blade. Try not to cut through the extended lip on the 8320's. When you get a spread started a small screwdriver can finish the job.
Glueing all this back together is somewhat tricky if you use gel super glue. It gets messy. I'll do a better job on my second IEM. Small clamps here would be great if you have them. I might try a water based glue on my second pair. I'm thinking a couple of clothes pins could be real handy here.
You can rob a cable from just about anything I guess. I'm waiting for a "Slickdeal" to come up for some cheap IEM's just to get the cable. Can't think of anything else right now. Enjoy!
More Edit:
I would like to comment on the quality of this IEM. The workmanship inside is first class. A strong glue holds the monitor in place and the solder joints are well formed. Someone used some care puting this together. This is much different than the Samsung IEM's that came with my blue tooth receiver. That was a pathetic mess when I opened it up. Quality on this 8320 can be deceptive. The case I could probably stand on. It's a strange shape to be sure. It looks like a Russian design to me, like a little sputnik... or the 50's hair dryer. That was a good one.