vintage crank knob 3d model

A detailed, high-resolution 3D model of a vintage-style metal and plastic turning knob and handle, reminiscent of a bulk candy vending machine mechanism. The central piece is a durable, chrome-plated metal turning handle (the 'crank') with a textured, knurled grip pattern, connected to a sturdy, smooth metal shaft that is approximately 15cm long and 1cm in diameter. This shaft has a hexagonal-shaped end designed to be inserted into a corresponding slot. The entire assembly should be rendered in a photo-realistic style, ready to be integrated into a larger design. Focus on the mechanical feel, wear, and clear separation of parts.