Redesigned articulating column design
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Redesigned articulating column design

Here's the stem at 180-degrees. The mounting plate for a ball or pan/tilt head is on the right in this picture. To put the stem back in its vertical position, you pull it out (to the right, in this case) until the red end is flush with the red metal collar, and simply pivot it back up, where it can slide down into its more traditional position.