A surgical instrument comprising: a housing; a rotatable member supported on a mounting portion of the housing; an elongated shaft assembly defining a longitudinal tool axis (LA-LA) and being operably coupled to the rotatable member for rotational travel therewith about the longitudinal tool axis; a source of electrical power; means for transferring power from the source of electrical power through a conductor extending through the elongated shaft assembly; and means for limiting an amount of rotary travel of the rotatable member about the mounting portion to a range of rotation comprising a predetermined number of revolutions about the mounting portion; wherein the means for limiting comprises: a distal travel-limiting portion on the rotatable member; a proximal travel-limiting portion on the rotatable member, the proximal travel-limiting portion being axially spaced from the distal travel-limiting portion a travel distance; and a limiter member (952 - figure 33) movably supported on the rotatable member for axial travel between the distal travel-limiting portion and the proximal travel-limiting portion, wherein the limiter member comprises a pair of opposing tabs on each side of an axial fin portion formed on the rotatable member; and wherein the limiter member is in threaded engagement with the mounting portion of the housing such that as the rotatable member is rotated relative to the mounting portion in a first rotary direction, the limiter member is axially driven towards the distal travel-limiting portion until contact therewith to thereby prevent further rotation of the rotatable member in the first rotary direction and when the rotatable member is rotated relative to the mounting portion in a second rotary direction, the limiter member is axially driven towards the proximal travel-limiting portion until contact therewith to thereby prevent further rotation of the rotatable member in the second rotary direction. a housing; a rotatable member supported on a mounting portion of the housing; an elongated shaft assembly defining a longitudinal tool axis (LA-LA) and being operably coupled to the rotatable member for rotational travel therewith about the longitudinal tool axis; a source of electrical power; means for transferring power from the source of electrical power through a conductor extending through the elongated shaft assembly; and means for limiting an amount of rotary travel of the rotatable member about the mounting portion to a range of rotation comprising a predetermined number of revolutions about the mounting portion; wherein the means for limiting comprises: a distal travel-limiting portion on the rotatable member; a proximal travel-limiting portion on the rotatable member, the proximal travel-limiting portion being axially spaced from the distal travel-limiting portion a travel distance; and a limiter member (952 - figure 33) movably supported on the rotatable member for axial travel between the distal travel-limiting portion and the proximal travel-limiting portion, wherein the limiter member comprises a pair of opposing tabs on each side of an axial fin portion formed on the rotatable member; and a distal travel-limiting portion on the rotatable member; a proximal travel-limiting portion on the rotatable member, the proximal travel-limiting portion being axially spaced from the distal travel-limiting portion a travel distance; and a limiter member (952 - figure 33) movably supported on the rotatable member for axial travel between the distal travel-limiting portion and the proximal travel-limiting portion, wherein the limiter member comprises a pair of opposing tabs on each side of an axial fin portion formed on the rotatable member; and wherein the limiter member is in threaded engagement with the mounting portion of the housing such that as the rotatable member is rotated relative to the mounting portion in a first rotary direction, the limiter member is axially driven towards the distal travel-limiting portion until contact therewith to thereby prevent further rotation of the rotatable member in the first rotary direction and when the rotatable member is rotated relative to the mounting portion in a second rotary direction, the limiter member is axially driven towards the proximal travel-limiting portion until contact therewith to thereby prevent further rotation of the rotatable member in the second rotary direction.