Since the coin object in our video presentation could not interact with a Wacom tablet, we had to adapt the tablet pen as our scratching device in the working prototype. To allow the Wacom tablet pen to scratch off material from the physical copy, we had to make a larger nib for the tablet pen. This was initially envisioned as a 3D printed part with one chiseled edge, due to equipment technical difficulties and availability, the end product was hand carved out of 1/16'' round basswood rods. 

The nib is created by shaving off layers using a round carving knife, comparing to the original nib, and cut down for size. There were several options for attaching the larger tip, glued-on, gradual change in diameter, and carving from the same piece of wood.