A catheter system comprising: a catheter sheath comprising a proximal end, a distal end, and a lumen extending within the catheter sheath between the proximal end of the catheter sheath and the distal end of the catheter sheath; a shaft member comprising a shaft that includes a proximal end, a distal end, and an elongated portion extending between the proximal end of the shaft and the distal end of the shaft, at least part of the shaft sized for delivery through the lumen of the catheter sheath to a bodily cavity located in a body, and the distal end of the shaft arranged to be delivered through the lumen of the catheter sheath toward the bodily cavity prior to at least the elongated portion of the shaft, the shaft member further comprising a housing physically coupled to the shaft at a location at least proximate the proximal end of the shaft; a manipulable portion located at least proximate the distal end of the shaft, the manipulable portion sized for delivery through the lumen of the catheter sheath to the bodily cavity; a projection extending from a location at least proximate a first one of the proximal end of the catheter sheath and the proximal end of the shaft; a receiver provided at a location at least proximate a second one of the proximal end of the catheter sheath and the proximal end of the shaft, the projection and the receiver configured to matingly engage at least when the at least part of the shaft is received in the lumen of the catheter sheath; and an actuator system (322; 545) operatively coupled to the manipulable portion via a control element, and the receiver to transmit force to the manipulable portion, the actuator system (322; 545) responsive to varying amounts of a length of the projection being within the receiver, dependent on a relative movement between the shaft and the catheter sheath, by varying the force transmitted to the manipulable portion under control of these varying amounts. a catheter sheath comprising a proximal end, a distal end, and a lumen extending within the catheter sheath between the proximal end of the catheter sheath and the distal end of the catheter sheath; a shaft member comprising a shaft that includes a proximal end, a distal end, and an elongated portion extending between the proximal end of the shaft and the distal end of the shaft, at least part of the shaft sized for delivery through the lumen of the catheter sheath to a bodily cavity located in a body, and the distal end of the shaft arranged to be delivered through the lumen of the catheter sheath toward the bodily cavity prior to at least the elongated portion of the shaft, the shaft member further comprising a housing physically coupled to the shaft at a location at least proximate the proximal end of the shaft; a manipulable portion located at least proximate the distal end of the shaft, the manipulable portion sized for delivery through the lumen of the catheter sheath to the bodily cavity; a projection extending from a location at least proximate a first one of the proximal end of the catheter sheath and the proximal end of the shaft; a receiver provided at a location at least proximate a second one of the proximal end of the catheter sheath and the proximal end of the shaft, the projection and the receiver configured to matingly engage at least when the at least part of the shaft is received in the lumen of the catheter sheath; and an actuator system (322; 545) operatively coupled to the manipulable portion via a control element, and the receiver to transmit force to the manipulable portion, the actuator system (322; 545) responsive to varying amounts of a length of the projection being within the receiver, dependent on a relative movement between the shaft and the catheter sheath, by varying the force transmitted to the manipulable portion under control of these varying amounts.