WMF Coffee Mill / Grinder Ass'y 33-2718-4000 for Bistro Series Machine 

Starbucks uses this equipment. Turns freely and smoothly by hand. From a machine which was dropped in transport and parted out. Includes the drive junction and the detector circuit board. These are ~$1800 new, if you can find one. 

FAST SHIPPING! - Most items paid for by 3 PM EST (Noon PST) are shipped out the very same day.