Originally Posted by
Road Fan
This is where I'm at, and I may be facing (lol!) a similar problem on my Mondonico. I'd start with "clearing the decks" to make sure everything that might need to be seen can be seen. I would not reassemble without re-facing the head tube ends, possibly line-boring as well. On mine I haven't started it yet.
You only want this done with proper HT reamer by someone that knows how to properly wield it, even if its not right, it may not tolerate much if any material removal before it becomes oversize and makes matters worse.
