a tool for a dismantlable medical instrument includes a first component , which surrounds a cavity for receiving a distal end of a shank , and a second component with a catch , which protrudes into the cavity surrounded by the first component to form a bayonet connection with a distal end of a shank protruding into the cavity , by engagement of the catch in a slit or a groove at the distal end of the shank . the first component has a recess into which the second component is fitted .