Just got this for Christmas and did everything up to the point of dumping the mixture into the bowl and determined that the drive assembly will not attach to the professional 6000 hd. Even this site says it is compatible with all kitchenaid stand mixers built after 1990. We now have to order a different icecream attachment (part number KIACA) and have now wasted 8 eggs and other ingredients and will have 5 very disappointed grandchildren. A simple label stating that is isn't compatible with all stand mixers should be required.