Originally Posted by
xlbs
I may be wrong, but is the OP suggesting that there is a shim between the cup and the lower headtube? If so, the shim may have been inserted simply to prevent the cup from rocking in an out-of-round head tube.
At this point, I don't think any of us, including the OP, are sure of what he has. That's why I thing he is overdue to take the whole thing to a bike shop and let them sort it out. We can't really do it from here and we are only guessing.