Perfectly calculated spirographic movement for flawless powder homogenization; we combined the art of espresso puck prep with the engineering of a Swiss watch. The MOONRAKER® rewrites the book on WDT and espresso puck prep as we know it. The Weiss Distribution Technique (or WDT) has been documented on the online coffee forum home-barista.com since 2006 as a method utilizing needles to break up clumps and achieve perfect "puck prep." The MOONRAKER takes that concept and mechanizes it with a calculated and calibrated spirographic movement to ensure perfect homogeneity. While other WDT tools create endless trenches along the same path, the MOONRAKER's patent-pending mechanism endlessly randomizes and homogenizes the coffee bed. There is no better way to prep for tamping. The MOONRAKER is designed for optimal compatibility with our own Unifilter and Unibasket products. It will work just as effectively on most standard 58mm portafilter baskets with rounded or rolled lips, but not on those with flat (90 deg) shoulders. While it is optimized for 18-22g baskets, larger and smaller basket sizes can be accommodated by cutting the length of the included spare needles.