Service Update:

We’ve had some isolated reports from our customers of the HG-1 2012 model of being unable to turn the burr mount backward or forward, and reporting that it has become seized or frozen. If you’re experiencing this issue, there might be two causes, and fortunately both are simple to diagnose and remedy.


seized burr mount

Symptom: the burr mount does not move clockwise or counter clockwise.

Cause: when grinding for the first time, the burr lock knob isn’t screwed down tight enough, and the burr mount slips to the zero position.

Diagnose: The inner and outer burr are touching. Remove the lower funnel and inspect the inner and outer burr.

remove the lower funnel and check if the inner and outer burr are touching


  1. Unscrew and remove the burr lock knob entirely from the grinder.
  2. Rotate the flywheel counter clockwise, while turning the burr mount counter clockwise.
  3. The burr mount should come free.
HG1_v02.2 - kitchen
simultaneously rotate burr mount and flywheel counterclockwise

burr lock knob loose for 2012 Model

Symptom: the burr mount does not move clockwise or counter clockwise.

Cause: the burr lock knob is not securely glued to the set screw, and remains in the locked position.

Diagnose: unscrew the burr lock knob entirely from the machine. If the set screw remains in the grinder, then take the following action to remedy the situation.



  1. Unscrew the burr lock knob, and it should come right off the set screw.
  2. On the end of the set screw, there is a hex drive. Use the 5mm hex key included with your grinder, to loosen the set screw, just as you would if the burr lock knob were still attached.
  3. Once removed from the machine, apply a little Loctite Super Glue (or something similar) to the first two or three threads of the set screw, and thread it all way back onto the burr lock knob until it seats. Let dry for 10 to 15 minutes before screwing the assembly back into the grinder.

We sincerely apologize to our customers if you’re experiencing this issue, and for the inconvenience that it has caused. This was an issue that was next to impossible for us to catch in our QC, and we’re taking steps to ensure this does not affect future versions of the grinder.

high pitch squeal at end of a grind

Symptom: squealing noise coming from the burrs at the end of a grind. Does not occur when grinding or when beans have cleared the grinder.

Cause: at the end of a grind, any remaining grounds / chaff / beans / residue gets caught between the inner and outer burr. This residue takes a little while to clear, and as a result, it causes intermediate contact between the inner and outer burr. This contact causes vibration, which is akin to rubbing your finger around the rim of a wine glass. Since the inner burr is mounted on a long stainless shaft, the entire machine acts like a tuning fork and vibrates.

Diagnose: high pitched resonating sound coming from the grinder.

Solution: the noise will disappear as the burrs gradually become broken in. It is also dependent on, temperature and humidity.