The Carrier, which holds the wirless microphone, is being snapped onto the handle shaft. Be certain to line up the channel. DIY-Kits should ship with the Cage already attached to the handle shaft. I urge vendors to pre-assemble this component for customers. Once the two pieces are joined, they are not meant to be disassembled again. If necessary, a twisting back-and-forth motion can safely dislodge the locking mechanism, so the shaft can be pulled back out. Don’t just yank on it. The snapping tabs will break under force.