Washing machine appliance having a removable agitator

A washing machine appliance comprising:

• a tub;
• a basket rotatably positioned within the tub;
• an impeller base rotatably mounted within the basket and defining a rotation axis, the impeller base comprising
• an impeller platform extending radially outward from the rotation axis, and
• a mounting face defined on the impeller platform coaxial to the rotation axis, the mounting face defining a recessed cup;
• and
• an extended post removably attached to the impeller base to rotate therewith, the extended post extending along the rotation axis between a bottom end proximal to the impeller base and a top end distal to the impeller base, the extended post comprising
• a base body, the base body defining an interior cavity from the bottom end to the top end,
• a mating face selectively received within the recessed cup in engagement with the mounting face,
• a bar latch pivotably attached to the base body above the mating face, the bar latch comprising a bent lever arm selectively disposed over the top end of the extended post,
• an auger fin extending radially from the base body between the bottom end and the top end, and
• a connector bar movably received within the interior cavity and extending between an upper end and a lower end, the upper end being attached to the bar latch to move therewith, the lower end being disposed radially inward from the mating face and below the upper end in selective engagement with the recessed cup.