Shop-vise repair: STEP geometry and nut drawing

The bundle contains two complete STEP exports and the existing nut drawing.
STEP files are byte-identical to the supplied neutral exports. Their author
and organization fields are blank; no personal names or workstation paths
were detected. Geometry and functional export records were not rewritten.

David Stout designed and manufactured the adjustment nut and handle.
The head laboratory engineer designed the locking component; David
programmed its CAM and ran its CNC machining. The handle itself is not
represented by a model in this package.

STEP supports CAD inspection and section views. Native Fusion design
history, machining setups and executable CAM are not included.
Both STEP files imported as solids through Gmsh/OpenCASCADE. This independent
import is not a guarantee of every CAD application's behavior.
