A few days ago a weird clunky noise came from the grinder.
Then a few days later it seemed not too grind.
it appeared to be blocked.
It had been set on 4-5.
I pulled it apart, cleaned and checked it, it has 2 shims.
Put it back together, same issue, works but no beans getting ground.

now I have reset it to 9-10, all is good again.
the grind is as fine as it was when I had it set on 4-5.

I used a naked P/F and VST baskets, so I can see what is happening easily.
EM6910 coffee machine.

Any comments