Great Machine; Terrible design flaw with disks and spindle

High quality machine. However, when using the disks, they can shred the plastic cover on the bowl and shred sharp plastic shards into the food. Mine did just that and the disk shaft got stuck on the motor spindle. It was impossible to remove rendering the machine useless. I called KitchenAid "customer no service" to explain the situation as I had read this occurs quite frequently. The machine was out of warranty and they would not provide any help or adjustment. Granted, the warranty expired 6 months ago, but this problem is a DESIGN flaw not a quality of materials issue. My guess is that this is a fine machine if you only use the chopper blade. Otherwise, I will never buy KitchenAid/Whirlpool again due to the lack of understanding from the customer service department. My cash will go to the upscale Cuisinart MP-14.