It's a normal thread. Counter clockwise to unscrew

Looks like you need to pry off the plastic piece thats sitting on the bottom of the doser. Or unscrew it out by that bronze colored nut in the middle

To get the pump going you could place it fitting-side down in a small pot of strong citric acid (or other descaling solution) and use a hand drill to cycle the pump every 10 minutes. Don't submerge the whole pump but just enough to cover the incoming and outgoing openings. I'd do this for a good hou...

Unfortunatly this seems to be rathwr common. Search Google for "k30 won't grind fine enough" and you'll find many threads about it. For ex: "Mahlkonig K30 ES problems - Not fine enough for espresso" I've seen it first hand as well with a K30 ES with the old style grind chamber. I ended up replacing ...

You might run into problems with desacling without removing the boiler. If you don't rinse the boiler very thouroughly after descaling you can get chunks of scale getting stuck in various places. If the boiler has a valve on the bottom to easily drain it, you might be fine. 10g/L is pretty standard ...

Very nice! Did you make those parts yourself?

How old is the o-ring? You should try to dismantle the valve and give it a good clean if it's giving you troublem

Yes if you use plastic or wood you're less likely to dent the fins but I imagine they can still snap if you really lean into it

Have you tried putting a metal rod (solid screw driver) in through the chute wedged under the burr carrier? This will stop the burr carrier from moving when you're unscrewing the top screw. A long allen key with an extention (small diameter pipe) should do it. That screw and washer don't look stock....

The Mythos One is pretty quiet. I haven't heard the new Malhkönig esprrsso grinders yet though