First to remove the mic cable. All connections in this headset are soldered. If possible, slide the heat shrink off the soldered connections to separate them with a soldering iron

these are the cord clips holding which prevent the cables from being pulled out of the dome.

The connections where the heat shrink tubing can not be removed, are cut with a pair of pliers.

With the mic cable connected, pull the cable inside the dome to gain easy access to the cord clip