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  • Wherever the crack starts, it runs around the stress raiser caused by the big step between the thick lug and the tube. That's why the best frames have the lugs filed to make the transition a taper rather than a step. Difficult to tell with the low resolution and out of focus pix, but possible dry joint at the front of the head tube allowing corrosion between the tube and lug to provide a site for crack initiation.

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