Just a bit of info for those considering Eric's HK-12, they're worth the wait. To my ears, they really capture the character of the original. Or, at least, what I look for in a CK12. Slightly bright and crisp, but without the harshness and grit you hear in many of the CK12s used in expensive production mics these days. Lows seem to be better contained than in one of the popular offerings too. (Edit; the above may have been taken the wrong way, I don't want to give the impression that there aren't other good options out there!). I haven't pulled my vintage brass CK12 to make a direct comparison, but as an owner of both I am very happy to use Eric's capsule and recommend it for those who want to build a mic with a real C12 vibe.