With a cellphone headset cable.
 
I thought some of you may be interested in this little recable job I did today.  I have owned the RE0 for a year and a half and I recently obtained a "smartphone" that comes with a set of iem's with an in-line mic hardwired to the cable.  Naturally I wanted the best of both worlds without another major iem purchase, so I decided to re-wire the RE0 to the cellphones iem cable.
 
The RE0 cable was failing near the mini plug and is the old cloth insulated type which is rather microphonic, so it had to go anyway. The phones iem cable is insulated with a nice thick rubber sheath and feels quite durable.  The only weak spot is where the slimmer cable above the Y-splitter enters the mic, but I'll just buy another cheap replacement iem if this ever fails.
 
The procedure I followed thus:
 
Open RE0 using brute force like I did, which caused cable on one side to break off.  No biggie, either way I had to desolder the original connections.  A fine blade would've helped here to prize open the casing.

 
Prepare new cable, snip snip!!  I left the original grommets on just in case but found I didn't need them.  With a bit of force I was able to pull out the old RE0 cables and slide the new ones up through the fixed (glued to the case) RE0 grommets, which luckily were a nice easy fit for the new cable.  If they were too tight I would have removed the grommets and tried threading them through with a needle, but the plastic grommets on my RE0 are fairly stiff and may not have allowed a larger object to pass through.

 
After inserting the new cables I tied a half hitch near the end of each as a strain relieving device.  Then I stripped the cables, however my auto-strippers are meant for building wire so it worked well for one side, but on the other it stripped the inner insulation as well, so I had to trim off the damaged wires and strip it again carefully with a pair of mini side-cutters.  

 
To secure the divers I drilled two holes in a block of timber that fit the tips snugly.  Use a very fine soldering tip and after a few goes I finally made the joins without any shorts.  I plugged the cable into my phone to test and one side didn't work so I had to redo it. The ?dialectric? hairs inside these generic cables can be a PITA.  I was pleasantly surprised that the resoldered driver survived the process as I held the iron on it for some lengthy periods.  That is testament to the robust design of the RE0 and/or that my Metcal soldering station has a very reliable and stable temperature control.

 
Reassembled and working

 
I am now one happy camper

Do you notice and change in the sound quality with the new cable?  My guess is they are probably both standard consumer-grade cables so there won't be much difference.  However, its a great way to salvage a pair of RE0's!  Nice work.

Hey thanks. Well I wasn't really paying much attention but I think that they do sound a little fuller now, however they sounded a little harsh when I first put them on. Tbh I wasn't expecting any change and perhaps it's just my imagination. I haven't been using my re0 lately either, so I really can't say for sure. On second thoughts, the change in sound was more likely due to the change in dap, from an iPod+arrow to my Galaxy S with voodoo sound

The cable seemed to be a better quality than the original when I stripped it. One of the wires on each side was insulated in a pvc jacket, unlike the original which seemed to rely only on the dialectric fibres to insulate one wire from the other. It proved a little easier to prep and took the solder more easily than the original did when I replaced its mini plug a while back. The outer jacket on the replacement feels nice and thick and it is utterly non-microphonic.

I may try to obtain a couple more of the same headsets for backup if I can. I'm pretty sure I've seen the same ones on eBay, but I won't be sure until I get one.