Bosch blender Fail 

BSH Home Appliances BOSCH / GAGGENAU / THERMADOR Part # 614008 Desc: DRIVE COUPLING
BSH614008042809
Fix Repair
Bosch blender Fail
I'm guessing the plastic coupler was meant to fail instead of the blade blasting something through the clear wall of the blender into the customer who decides to blend gravel with their blender.