LMSC
As sure as I can be, I tried a few times, and always cleaned the burrs and everything. Used to move the dial while grinder was on, so zeroed right when I could here the slightest sound, and not when the sound was harsh. Just did not want to damage anything. Wondering they can try to re-zero it for me.
They also told me the use on the 4 mark for espresso. Which doesn’t mean much without knowing the machine, basket and amount at least. Did ask though, without a response.