I followed the modifcation suggested by Linkwitz and explained
clearly on Speakerbuilder.net.
The modification increases the mic's SPL capability and reduces distortion. The modification is not neccessary,
but since it's simple to do (in concept) it's probably worth the fiddly work if you can afford to waste a few capsules
in the process.
Scape out the trace that is connected from one of the terminals to the capsule housing using a sharp knife (I used a scalpal),
and connect the other terminal to the small tab (opposite the green dot) with some solder. Connect the wires to the termials (now they are
reversed) and that's it.
The soldering is fidly so you may go through a couple of capsules getting it right. As you can see, my soldering is not up
to scratch, but a quick check with the multimeter shows the old trace has been etched away properly and the new connection is good.
After a quick test (connected to a sound card), I applied some epoxy to the back of the electret to ensure the connections aren't distubed when fitting the
capsule to the housing.