Hello all, new guy here. I wanted to post about my own Etymotic cable journey. I love my er-4 phones, but there were always a few issues for me. I could never afford a cable from apuresound, so I build my own!
I'm an EE, so i dug around in my toolbox and found the perfect tool for removing Ety cables...

no muss, no fuss, perfectly shaped for pulling off the connectors with no damage.
then, I hopped on ebay and saw these:

A bit bulky, I asked for mine to be sent unassembled. Basically I wanted the pins and the little pcb, and then I tossed the plastic dome housings, and the cable side connector.
I soldered in a 20R 1206 SMT resistor on either side, then soldered in a westone cable:

I cut off the connectors and memory wire on the cable, and soldered the wires to my modified pin connectors. There were enough holes on the tiny pcb(a 2x4 grid of perfboard would work too) to thread the cable through one side to strain relieve it.
A little bit of heatshrink later and voila:

Sorry, my only camera is not great, but you get the idea. Now the whole setup is super small and comfy, no pod anywhere. Easy to wear over the ears, and microphonics are non-existant. About $80 total outlay for the setup. Now my Etys are getting WAY more listening time. And I didn't have to spend more for a cable than the earpieces.