Bottom headset cup doesn't sit flush After a crash, I noticed my bottom headset cup was no longer sitting flush with the frame (see the right side of the image below). If I grab the headset cup I can rock it back and forth slightly. No cracks I can find at all.

Is it possible to repair this and get the headset cup to sit flush/tight again or is the frame ruined?
The frame tube around the cup may have been 'ovalized'. The fork can exert considerable leverage on the bottom of the head tube. 

The bearing cup needs to be pulled out and the frome inspected. Specifically you need to check if the tube recess for the cup is still round. This can be done with a good set of digital calipers by taking inside diameter measurements at right angles to each other.