Assuming that you are referring to the type 1 9mm then you must mean the screw that sits in the 2" skirt and locks to the outside of an 1 1/4" holder. In my view this is a useless part that still sits in the box. I even machined this part of the 2" skirt off my type 1 so the eyepiece can sit better in the 1 1/4 holder. I would not worry about selling it without the screw as I doubt anyone will use it and its absence will not diminish the value.
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