The micro switch works OK but the mechanics of the ring slider for the micro carrier has too much play. I got cutouts for the microphone.
Solution: disassemble the micro switch carrier PCB as described above; the swich know stays out like a triangle. Carefully remove the triangle (it is clamped into the housing with 2 sideways plastic studs) with a forceps (it comes out with a flimsy metal tongue), put it on a plain area and remove the top of the triangle with a cutter knife.
