Abstract: A tool for manipulating a solid object (12) in a cavity (16) of a human or animal body, comprising a longitudinal rod member (14) adapted for insertion into said body cavity (16), a first coupling member (26) connected to one of the rod member (14) and the object (12) through a flexible filament (28), and a second coupling member (24) connected to the other of the rod member and the object, said first and second coupling members being arranged for being mechanically coupled together through magnetic attraction, wherein one of the first and second coupling members forms a recess (30), the other of the first and second coupling members is configured as a key member (26), and magnetic poles of at least one of the first and second coupling members are arranged for drawing the key member into the recess along a direction perpendicular to the longitudinal direction of the rod member, wherein the key member and recess are constituted such that when the key member is drawn into the recess, an operative contact surfac