"My headsets a bit gritty"

That's what he thought, "might need a bit of grease"

you can see mud drizzling out of the bottom.


inside it was indeed gritty. Bits of broken bearing race in a tasty greasy paste. nasty.

(Not my bike! I hasten to state: just an example of how a fault can get gradually worse without you noticing just how bad it's got!)