Model 444 has something blocking the motor from turning.
The inside turns free.
The unit will run then stop and buzz.
How do I free the impass?

Take the offset wrench that came with the disposal unit and insert the wrench into the flywheel turning hole in the bottom of the unit. Once the wrench is inserted, turn it clockwise to dislodge the stuck impeller or flywheel. When it dislodges, you'll feel the flywheel turn freely.