grumpus

I suppose so, in as much as it's probably not worth doing unless you have a tame frame builder, but I don't know - is this some sort of vintage classic machine? And there may be other ways of mitigating the problem, assuming my diagnosis is correct - deform the head tube in a few places so it "fits where it touches". Or deposit a bead of braze/weld in the tube and grind/ream it back to dimension. Secure the cup with J-B Weld. They're all bodges but may be good enough; I epoxied the bottom bracket in my Holdsworth when the shell distorted (a known weakness apparently) and it lasted a couple of years before I had it properly fixed at considerable expense - I wouldn't have bothered but it needed some other work, and I'd built another commuter/touring bike so I didn't need it on the road.