Hi Phil!
I have not had the nerve to write down my long path of preparing to open a coffee shop yet, but because it's quick (and hopefully useful) I'll write down my experience about disassembling a grinder-doser for cleaning properly. (which can be tricky if the spring jumps out
)
I think I don't know some vocabularies, so I hope I don't leave you with too much lecturing
So here it comes:
I got a La San Marco grinder (which has Mazzer blades inside) in ebay for 75 €. It was used in a sport club and VERY dirty. Unfortunaly I forgot to take a picture from the clotty burr-blades. The coffee was agglutinated and covered the 3 metal-thingies who are positioned around the blades to sweep the ground coffee out into the doser...
So after removing the funnel, I unscrewed the huge metal ring with the scale on it. On the bottom side of it you will find the upper burr-blade. That's easy to clean. Watch the slits around it - you might find some fossilized coffee in it.
Hint 1: When you take out the lower burr - mark one of the 3 thingies/leading-knifes (?) AND the 2 burr edges/jags parallel to it with a water resistant pen!!!! When cleaning it, take care not to scrub the marks off!!! If you don't position the burr at the exact position again - the two burrs will "bite each other" when the grinder is reassembled and you adjust a finer grind....
Next - take off the doser. You can't imagine how much coffee you will find in there...!
For the LSM I used several allen wrenches and one phillips-tip-screwdriver.
Start with taking off the little part that stops the grind electrically, on top of the doser. Then comes the transparent plastic part. Before you can take that off, unscrew the handle in the middle of the doser - a huge spring will pop out - but it's selfexplanatory how this has to be fit in again.
As the electric-stopper part is soldered on and I didn't wanna open that, I couldn't get it off the transparent plastic, so I just let it hang in there. In the picture you can see it on top, still connected with the grey cable.
After removing all that is easily screwed off - you will see the following picture: