RichardWalter wrote: What a mess! There was caked-on, oily, tarry coffee crud all over the inside. I had to scrape some off with a screwdriver. There were also pieces of packing peanuts from the shipment. I'll be reassembling her next and giving her a whirl.
Richard, your earlier thread about thin extractions made me think your MDF probably needed new burrs. Cleaning is fine, but it's hard to imagine such a crudded up grinder not needing burr replacement.
As so many people will be so very anxious to tell you, the MDF or the Rocky are poor investments if bought new on todays market, but your used one is quite capable of world class shots if tuned up. If your thin shots don't improve after just a cleaning, don't conclude you need a new grinder to make good espresso. Change burrs, then give it a whirl.
Trust your taste. Don't trust your perception.