An assisting apparatus for using power from a rotating member to assist the operation of a bicycle transmission includes a mounting unit and an input transmission member coupled to the mounting unit, wherein the input transmission member moves to at least a first input position, a second input position and a third input position. A substrate support is configured to hold the substrate. Also included is a metrology module for measuring one or more film thickness properties. Any row of loops can be removably secured to the row of buttons to enable at least a portion of the window treatment to be raised while it is positioned over the window opening. The result is less light loss through diffusion, improved reflectivity.