I remembered finding this in an older post. Pictorial of doser disassembly.
http://www.kaffee-netz.de/reparatur-und-wartung/18436-mazzer-mini-dosierer-zerlegen-und-reinigen-teil-1-a.html
JohnB. wrote:I can see removing the lower burr to clean under it but why remove the entire burr carrier? Is there a space under there where grinds collect?

dsc wrote:Hi,
John you would be surprised to see what sits under the lower burr carrier in grinders that haven't been cleaned at all for a few years. Here's a photo of what the lower burr carrier looked like on my used Major:
It was like rubber and very hard to remove, not to mention that it looked awful and smelled terribly.
Regards,
dsc.