On behalve of our "brother warrior" DERG I am posting here some links he sent meanwhile. I think they are all very useful for fact finding.
Application of bearings - SKF.com / Products / Interactive Engineering Catalogue/Rolling bearings
Furthermore there are these:
This the key video but DOES NOT DISCUSS TORSION OR TWIST ON THE SHAFTS
Also does not discuss CONCENTRICITY of THREE SHAFTS
http://www.eng.ox.ac.uk/thermofluids...pt#452,17,Heat Transfer between Rotor and Seal
Schaeffer ROLLER bearing
http://www.schaeffler.com/remotemedi...e/0001614C.jpg
Schaefer
For 787
FAG bearings selected for Boeing 787 aeroengines
Okay, thatīs it for the moment, hope it all works