how does it come out.is there a tool I need or what
Are you talking about this part or the part this screws on to? (drive block)
http://www.appliancepartspros.com/whirlpool-nut-lock-wp21366-ap6005824.html
http://www.appliancepartspros.com/whirlpool-block-basket-drive-wp389140-ap6008836.html
Video