This cap fits over the attachment hub of a KitchenAid stand mixer and houses a bearing. It is for stabilizing DIY KitchenAid attachments. I use it with a
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Milescraft drill adapter coupling (http://www.thingiverse.com/thing:39960).
More information: http://absurdlycertain.blogspot.com/2012/07/update-2-diy-hario-conical-burr-grinder.html
Available on Shapeways: http://www.shapeways.com/search?q=kitchenaid
