You love your Etymotic ER-6i headphones. Mine decided that the plug should start being sketchy, leading to me having to gaffer tape them in a specific orientation to keep sound going in the left ear.
At the same time, my iPhone headset earbuds started to get a little "meh" (ie. rubber coming off the earbuds), and I missed the sound isolation of the ER-6i in the BART transbay tube, since I was using the iPhone headset for the convenience of the remote. (I used to have an old iPhone, but the new one doesn't have the same headphone jack problem so that's a moot point.)
Thanks to this flickr set by jeffb, my main resource. I also referenced this video.
Step 1: Supplies!
Etymotic ER-6i headphones
Apple iPhone Headset
3/8" diameter, 2:1 or 3:1 heat-shrink tubing (found at a hardware / electronics store)
(alternatively, you could probably just use electrical tape or something, but I didn't try it)
a soldering iron (with thin / fine tip)
a heat gun (or alternatively, a stove, or high power hairdryer and the corner of a box?)
scissors / knife / xacto / diagonal cutters (various sharp implements)
maybe some small needle-nose pliers... (or nimble fingers).
a pen, with a thin tip.
1/16" drill bit (depending on your patience)
maybe some sticky tack to hold stuff (see step 8)