US Patent 7637023 Threaded stud position measurement adapter

The present invention discloses a position measurement adapter for attachment to a threaded stud, the adapter having an elongate rigid member with a first end and a second end. The elongate rigid member has a threaded aperture that extends along an axial direction from the first end to a distance that is spaced apart from the second end. In addition, the elongate rigid member has a hollow shaft that extends in the axial direction from the threaded aperture towards the second end. The hollow shaft is radially larger than the threaded aperture. A contrast target can be located on the second end. In some instances, the hollow shaft extends to the second end and the elongate member has a cylindrical shape.