It does take 5/8" tooling. Frank Fords reducing tooling is really interesting. He has a web page that describes how the tools were made. That small Geometric Die Head is sweet! I'm going to start looking for a 3/4" size but the prices are pretty stiff.
I'll have to dig around when I have time and see if I can find it. I have never seen that article, but have certainly talked with Frank about turret tooling and his Rambold in the past...it's been a while. I have a Geometric 5/8" DSA, and have quite a number of chasers for it, but primarily have done 10-32 in the past. Sadly, I don't use it too often these days as I don't make very many hand saws.
Kind of irony in that I first met Frank at a metalworking group that met in the Bay area, I was seeking to learn how to turn a split-nut as used on the vintage woodworking hand saws. Another gent in the group helped me make the first few on his lathe, and then I adapted it to my little South Bend. When I saw how Frank's turret worked I just drooled, not that I had high volume, but that it takes me about 15-30 minutes to make a single split-nut including the slotting of the washer portion. I use bronze for them.
Turrets are awesome for making screws, those die heads with a sliding bed turret is just amazing for those procedures on the lathe.
I might have some extra turret tooling duplicates I may be willing to part with for a very reasonable price, if you're interested. I have a number of drilling tools, support tooling possibly, centering, stuff like that. And to give Doc a plug here, he made a rotary broach out of a turret tool which is a project I've had on my list for some time...I had bought a turret to adapt to my Rivett lathe, but decided to just use the South Bend 10L for that as I have the lever cross slide as well as the bed turret.
I don't know if Frank looks in on the Antique forum too much. Would be nice to hear his comments, he did replace the bearings or made plain bearings for it (seems it has roller bearings), or something to it. I know he did a few things to get it running.
Cheers,
Alan