I bought this not realizing that it won't fit KSM7 (KitchenAid Stand Mixer 7qt) models. I froze my bowl all night and had everything ready; but couldn't figure out why I struggled getting the drive assembly on. Very disappointed to find that there in fact is an attachment that doesn't fit every mixer produced since 1919 as this company boasts so often.  The message here: read the fine print on all attachments anyway.