Techniques for a rating system are described, including presenting a visual field including two or more axes, each axis representing a criterion associated with an asset, receiving a user rating associated with the asset, the user rating including a point on the visual field, and updating a presentation of the visual field to include the user rating. The target marker also includes a driver operably connected to the quantum cascade laser and configured to pulse the beam at a desired repetition rate. Dilators are used to increase the size of the drilled groove. In addition, these operators can identify a large class of schema mappings and distinguish effectively between alternative schema mappings. The planetary gear damper provides for torsional damping which has long travel and provides low rate damping.