Originally Posted by
seypat
Could be a stuck stem gone bad. Heat applied to the head tube and the stem wouldn't budge. Look at the black crud on both headset ends. Might be burned grease/lube. That's a shame.
-----
interesting idea there!
another possible cause for the presence of the black crud could be that the assembler lubricated the head cups when pressing them it and this is just a bit of grease which has collected dirt in the time since the assembly.
[have no horse in the race
]
-----