I've always lusted for a collet hand wheel chuck. Obviously the Hardinge must have a very accurate back to fit your in-situ back plate machining with a nice low runout.
I'm sitting at ~0.0025". Actually I was mulling over how I might modify my existing chuck/adapter interface to get it dialed in. The back plate engages the nose lathe spindle nose profile once the cam locks are tightened so that's established. The recess in the chuck back engages a matching boss on the back plate. I have had them apart, tried different orientations & the fit is nicely tight. So unfortunately this assembly combination gives me the resultant runout I'm seeing. I want it better. I was thinking of reducing the chuck boss diameter by a couple thou, coating the lip with machine tooling epoxy like that Moglice stuff, mount the chuck, dial in the runout to zero, secure the bolts & let it cure. Theoretically it is now matched to my lathe. And its probably permanent, or at least I'm on uncharted waters if they will ever come apart easily even with a release agent. The Set-Tru system is of course mechanically set-able. So I'm leaning towards getting it & selling my chuck to offset the wallet owie.