A track stick for a keyboard having a base plate affixed to the keyboard frame and a flexible substrate disposed on the base plate. The system comprises a deposition chamber sealed from ambient air. A plug is disposed in the bore to seal the bore. The coupling portion of the body is engaged with the body mount structure of the base, and the tail portion of the body is releasably secured or captured to the base so that the body is located in an operative position for use of its working portion. This also allows formation of emitter complexes from effective hole or electron transport materials.