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That is a slide tho extend the tube to help bring your webcam to focus if you don't use a diagonal. Eg I cant focus my ToUcam in my Orion without the diagonal, this allows me to achieve focus by sliding the tube further back. But mine is slightly different to that one. I only have two screws directly opposite each other in the slots for sliding. Mine doesn't have that third screw (pointing down and further up the tube in the photo)
You will still need a T adapter as there is no screw to clamp your webcam in with the standard 1.25" adapter.
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