Originally Posted by
qcpmsame
Is the configuration you have in your last picture with bearings in place? Try the proper fixed cup instead, just for giggles, and see what the result is if you haven’t already done so. It might be the spindle dimensions are not correct for that bottom bracket also. I had to search out a correct spindle for my Tommasini since the 70 SS would not fit correctly, and that bb needed facing badly. The LBS owner/mechanic has the complete Campagnolo tool selection and he did the deed in a morning, along with chasing the threads on both sides properly.
Don’t take it that careful QC inspections were done, its a different world now. (From real world quality control engineering experiences.)
Top pic is with the fixed cup. Experiment was done with the caged bearings in place. Pretty sure it's the right spindle with the cups. I'm no frame guru - always assumed thread chasing was strictly to clean up the threads, but I wonder if a proper thread chasing, along with facing will address any subtle misalignment between left side and right side threading.
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N = '96 Colnago C40, '04 Wilier Alpe D'Huez, '10 Colnago EPS, '85 Merckx Pro, '89 Merckx Century, '86 Tommasini Professional, '04 Teschner Aero FX Pro, '05 Alan Carbon Cross, '86 De Rosa Professional, '95 Gios Compact Pro, '95 Carrera Zeus, ‘81 Masi Gran Criterium, ‘81 Merckx Pro, ‘89 Cinelli Supercorsa, ‘83 Bianchi Specialissima, ‘VO Randonneur, Ritchey Breakaway Steel, Rivendell Rambouillet, Heron Randonneur, ‘92 Ciöcc Columbus EL