Hi,
I can finally post again. I had to verify my phone number and address.
Dan, you got it mostly right, just some typos. Did you retype the whole thing I wrote?
Anyway, yes, the reason I went with a Micro Ridge is because it was already on the new suspension/coil frame/cantilever/diamond subassembly that I can get from Orbray that save me a lot of time and you a lot of money. Incidentally, the Micro Ridge is the same diamond that is on the DV-20X2. The Ogura 7/30 micron is more of a semi-elliptical because it is an extremely short line contact. Consider that the most common elliptical is 8/18 and you see that the 7/30 is a miniscule amount narrower in tracing edge and not even double the length of the bearing edge. Also, Ogura Vital PE ellipticals are made in such a way, true ellipsoid, that according to what I see under my microscope, wear with “cat eyes” and not large circles like a standard elliptical. In other words, they wear like Ogura line contacts and are likely made the exact same way. So while Ogura very short bearing edge styli are called elliptical based on shared dimensions with standard ellipticals, I do not believe they wear the same way and lose high frequency tracing ability halfway through their service life.
Just some thoughts.
I hope you enjoy listening to your cartridge as much as I enjoyed rebuilding it.