Chas, as always, your replies are so thorough.
Dura-Ace made wonderful hubs in that early Uniglide-and-into-Hyperglide window. Yes, finding the DA-only screw on cogs did require diligence. BUT the real fun begins at 7s, when the DA hub requires not only the outer screw-on cog, but also a special 2nd position cog with built in spacer. Without that, the second cog could easily slip.
The two necessary cogs.
I’m unclear if the Uniglide-only hubs at 7 or 8 speed require this cog /w spacer, or if it is the Dura-Ace that really needs it. The spaced cog will fit both standard Uniglide and DA-specific hubs.
SO, as long as you conserve your special DA-only cog supply, Bob’s yer uncle.
I have a special affinity for hubs that are both Uniglide and Hyperglide compatible. I use the Uniglide cogs up to 21t, or so, and Hyperglide for anything wider. I like the performance, and, as said above, when the Uniglide cogs wear, just flip ‘em over.
As I ride almost dominantly C&V bikes, I like these hubs and the gearing.
ymmv, of course.