Abstract: A movable work support particularly adapted for use within a silo or similar cylindrical structure is disclosed herein. The work support comprises a frame supporting a work platform and a winch mechanism. A cable extends from the winch to a point of securement at the top of the cylindrical structure, and extension or retraction of the cable from the winch mechanism will cause the framework to lower or raise, respectively. A first pair of wheels is located at an end of the frame opposite the location of the work platform. The first pair of wheels is positioned to engage the side wall of the structure and to roll along the side wall as the frame is moved vertically. A second pair of wheels is mounted near the first pair of wheels on the frame and is oriented to roll along the side wall as the frame is rotated in a horizontal plane within the structure.