I used the 2072Z0005 capsule, which is the one out of the older C414EB, nylon capsule. Obviously the brass capsule is better but is best used in an AKG mic. Sounded pretty nice, though there was still a bit of harshness which was due to the grille design. I think it is too small or too closed. Tearing out the inner mesh and leaving just the outer one seems to help the sound and get rid of some of the spitty sound. Anyways, swapping the capsule gets rid of most of the 8kHz, the mesh takes care of the rest.
I've used a DRS capsule, AKG, and ony of my M7 clones and they all sound good. I've even put one of the old Syncron AU7 capsules in one. The DRS capsule is a bit shy on proximity effect - it's pretty balanced up close but a tad bit bass shy when you get farther away. Oh yea, DRS = Debenham, Robinson, Stebbings, it's a microphone capsule design published in a mid 1960's audio magazine. Anyone with access to a mill and a decent lathe, and a lot of patience, should be able to make one from the article.
http://www.10000cows.com/DebenhamCapsule.jpg http://www.conditionedresponse.com/DIY/microphones/Debenham.pdf
When this article was written, few companies were making condensor mics - Neumann and AKG, obviously. A few other German companies. Sony, Capps, Altec. Now that condensors are cheap (thanks to Audio-Technica, Alctron, and 797 Audio), the motivation to build one to save money is a bit less, I think.
-Dale