Stress risers in head tube
Image: https://cimg6.ibsrv.net/gimg/bikeforums.net-vbulletin/846x1080/20180811_145833_51ff276c4f0ae7c0fb866db73d1c38ee92918597.jpg
Image: https://cimg9.ibsrv.net/gimg/bikeforums.net-vbulletin/846x1080/20180811_145804_72dbded260b612f43aab971a5dda3aae5ade738a.jpg
I needed to remove some headset...