Systems and methods for accurate position adjustment of thin-film PZT micro-actuators are provided. This invention also provides compositions comprising a compound of this invention and the use of such compositions in methods of treating diseases and conditions that are beneficially treated by administering inhibitors of cyclic guanosine 3\u2032,5\u2032-monophosphate specific phosphodiesterase, in particular PDE5. The risers allow for the device to easily expand to height consistent with traffic engineering design standards for triangles when in operation and then compact when it is in storage.