Race_Tech

Yes like I said a float in bell rotor/bell assembly like pictured above and on the performance friction picture on the previous page allows expansion of radial and axial float through the bell vs the rotor rings. It is a different kind of approach and has its strong and weak points one of which is increased bell wear when compared to a conventional float system. AP Racing uses a bobbin system that like you have stated pushes the bell up so that it is not held tightly against the rotor ring in a rigid form like a bolted pattern would be. Also Stoptech, Brembo, Alcon all use systems which are a compromise between bolted and floating so they do not show the true benefits. Although some are better than other Brembo and Alcon. Stoptech is complete garbage as their float system is a joke and their rotor rings wear at an exponential rate when compared to Brembo and AP Racing.

Here are some close pics of the bolts, bobbins, the assembly etc.