Hey thats my M7!
Aint she bewdiful :grin:
All you have to do to get it open is loosen the grub screw thats just behind and a little above the Neumann logo, then gently twist the head and pull it away from the shaft. Then you undo the screw on the top of the head and the front half should come off. Sometimes this screw is covered with putty, just scrape it away.
The only thing youve gotta watch is to make sure the copper shim that fits between the head and shaft goes back in flat when you put it all back together. If it doesnt it will short the capsule out and youll get no sound.
Also, if you want to make it omni, simply join the two metal tags that come from the front and back sides of the element. I joined them with a reed switch so I can switch it to omni by sticking a little rare earth magnet on the grill...but I think theres a thread about that already.
M