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Tried like a mofo to hammer out with hammer + headset cup removal tool. After literally 500 strikes, net movement was 1mm.

Yeah, I'm sure I could have hit harder and harder, but was reluctant to b/c (1) bike is carbon fiber, (2) rim edge of the inner headset aluminum cup was deforming from the hammer/tool strikes, (3) couldn't imagine what brace I could readily make that wouldn't make me worry abt a frame pressure point. I'm sure lots of folks have given much heavier strikes and with no frame damage, but I was reluctant, esp given bikes in short supply.

Finally, dremel'd out a weak line as in the photo below. This weakened the lower cup rigidity significantly, allowing normal hammer/tool strikes to pop it out.

Man, what an ordeal! All for putting on a 1 degree off set headset. Also, quality kudos I guess to Ibis -- that is a tight fit headtube!

Yeah, hack job, but I'm a hack and didn't want to give up (next time, my objective might be to save 6-7 hours instead).
Hand Finger Helmet Wood Gas
 

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It only got stuck because it's orange. ;)

But for real, I wonder if they used some kind of gap filler/assembly paste-type stuff when they put it together. I've heard of that with bottom brackets on some carbon frames. You might ask Ibis/LBS to see if that's the case for yours.
 

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I’ve had to do the same thing twice to Chris King top caps. The caps fit tight around the steerer tube upon installation. The tight fit, plus corrosion from sweat, seized the cap around the steerer. Both experiences were super ugly. I drop the fork, clean and grease regularly now.
I recently had to take off a CK crown race.
It really was the tightest one I ever had to deal with so far.
 
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