an apparatus is provided for electrically indexing a rotary component . it includes a housing , a resilient , electrically conductive band contained within the housing and connected to the rotary component , at least two indexing electrical contacts located on the housing internal periphery and in slidable contact with the band , and a bridging electrical contact in connection with the band . the band exerts a biasing force on the housing , thereby maintaining band contact with the housing internal periphery , while also causing a point of separation of the band from the housing . electrical circuitry is also provided so that once an indexing contact has been selected , the band and the rotary component can be rotated until the band disengages from the selected indexing contact , thus halting further movement of the band and the rotary component .