A method includes providing an elongated probehaving a longitudinal axis and a distal end, and capableof rotation of the distal end about the longitudinal axisin mutually opposite first and second directions. Whilean operator manipulates the probe within a body of apatient, the rotation that is applied to the distal endis sensed automatically. An alert is issued to theoperator upon sensing that the rotation is in the seconddirection, but not when the sensed rotation is in thefirst direction.
