Need help: Bowman headset repair

[nickless]

I recently bought a defective bowman headset that I want to repair and then use on a PMR radio.

Replacing the microphone should not be difficult, but I can't open the case of the speaker. Does anyone know if there is a trick to it or will brute force be the only way?
Also, does anyone what impedance of the speaker and microphone I need to make them work properly on a PMR radio?


Thanks in advance!

[SafetyCatch]

I got mine open with force, though I'm sure there must've been a better way.

[nickless]

Well, I guess I'm just going to have to try it out - what kind of tool did you use?

[D.Sigurdsson]

the mics are 99.9% likely to be condenser mics.
http://en.wikipedia.org/wiki/Microphone#Condenser_or_capacitor_microphones
Speaker is somewhere from maybe 75ohm to 150ohm.
PTT __
mic line ---------/ --------| |
shield -------------------| |
__

/
speaker ------------------|
shield ------------------|
\

In regards to your PMR, there maybe a specific impedance, but thats not possible to say unless knowing what type of a PMR you have.