Looks like the 750 also uses the same bearing/platter/belt system as the 412.
The 411 and late production 412s used the "borg death cube" motor. They're suspended, just not on the potbelly Barry isolators like the Papst motor used in the first 60% or so of 412 production. The tables with the "death cube" used the same Lord isolators as Rek-O-Kut and Empire. Rather astonishingly, both types of isloator are still in production, 60+ years later. The Lord mounts being somewhat easier to buy, due to their use in Empire and RoK tables. Only a handful of manufacturers used the Barry mounts that I'm aware of, and all were low production companies (Fairchild, HH Scott, Pickering, and Gray).