I just took a frame I'm restoring into a local shop to have the headset pressed on. The mechanic pushed the cups in with his fingers and said that's really bad. He said the head tube was too loose by about .2 mm. He said over time the head tube gets a little wider and there is no fix.

Is there anything I can do to fix this? I've spent the last several weeks painting it and I've already bought all the other parts i need for this bike (wheels, crank, handle bars, etc, etc).

The mechanic said it's not safe to ride. Why not? I can see it being annoying because of the play/knocking in the head tube, but how would it fail?

I'm pretty bummed about this right now...