• It looks like a headset has been put on cross threaded at some point and chomped up the threads.

    You can get it covered in braze and the threads re cut. Would be the best way to save the fork for sure. As a quick home effort you could get an old steel headset and try to clean up the threads with that as a makeshift die, so long as you can get it to screw on straight and true.

    As the Campagnolo headset is aluminium you could clean the threads by running them up and down another steel fork with a good thread. Just clean all the dirt off the threads first so it doesn’t bind up on anything.

    You probably know this already but you need to lubricate the thread with some oil and wind one turn and wind it back and just go bit by bit to keep it from binding up on any swarf.

  • 2nd this.

    And if it doesn't solve you problem, take your fork to a decent frame builder and they van certainly fix it. Worst case they'll have to braze a new steerer tube in.

  • Thanks again for all the kind advice! If that doesn't solve my problem.. who would be a decent frame builder in London who won't be charging me the cost of the frame to fix the fork threads?

    Also, @Dogtemple it feels like the campag headset is completely not biting on the fork threads, would cleaning the threads make any difference? Completely didn't realise that there was a way to put a headset on other than 'screw it down' so thank you for that advice as well!

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