2 things that I have discovered since I ordered the parts from AKG I posted on the previous page.
If this project is to use the parts you order from AKG (their PCB & plastic PCB holder, I don't know if the ring will need to be used), you can not insert them through the front of the threads on the mic body tubes so I assume this would be the same with any brass colette that was to be machined. Second, about the only way to use the AKG parts would be to have some kind of design where they enter the colette like the AKG body circuitry enters, from the back.
If the AKG parts were to be used there always is a chance the parts are discontinued, if AKG comes out with another style of condenser mics.
I have thought about the retaining ring that was talked about but I aborted that thought since AKG parts couldn't enter the front of the colette (based on previous assumptions stated above). I think that if a custom PCB is made, though, there is a chance that the original colette's may work from a design standpoint. If a retaining ring is to be used I thought it would need to be plastic because I have not been able to find brass rings online (I searched through a few pages of google is all) and I figured that any other type of metal would cause corrosion either on the brass, or the retaining ring itself and leaving a residue on the electronics of the colette causing problems with the longevity of the head/box. I have found however a website/company that will make custom ring's online (
http://www.arconring.com/design). I don't know prices or any info along those lines.
http://www.arconring.com/eaton/internal-notched-retaining-ring-in < website page is an example of the type of ring I think would need to be used, not necessarily the metal or finish.
I also do not know if AKG parts are discounted for larger orders, if they do it may be something to take into consideration.
Again, link to pictures of 460 bodies, caps, pins, electronics that I took as well as AKG parts I ordered.
AKG bodies etc
http://www.flickr.com/photos/davidkrogh/sets/72157624728953731/AKG parts (PCB, plastic holder, ring)
http://www.flickr.com/photos/davidkrogh/sets/72157624977412924/If people would like to see some other angle with parts/bodies I will take the pictures and put in the appropriate album.