From the Stellar Technologies web site:
A modular system that can be switched between Ronchi-grating and knife-edge focusing, the Stiletto focuser temporarily attaches to a telescope in place of a camera body (either conventional film or CCD) and allows you to quickly achieve pinpoint focus using a star. Once the telescope is focused, you replace the Stiletto with your camera and aim at your target, whether it be stars and deep-sky objects, a planet, or the Moon.
Stiletto modular focusing system. In addition to the standard Ronchi gratings, their optional knife-edge focuser is included. All unused.
Includes both a Nikon focuser AND also a CCD module.
Prices: List for the Nikon, $179 + CCD module, $115 + knife edge, $20= $314, I will sell all three for $157!!!