It could prove that tapping it out flared the tube, or that the headset that was in there was simply a better fit than the one you want to use.i had the same issue with my titanium Torus.a Chris king would push in by hand, and whilst it would not turn much. I wasn't happy.i now have a large collection of headsets, but at the time, a member on here sent me a load he had and I guess due to the tolerances, one fitted perfectly and needed to be pressed in with a tool (a kore headset). Bought a spare one, just in case I needed it. If you want to try other headsets, let me know as I have a few now and if one fits, and I have it in the colour you want, everything is coming up Milhouse.