clamping mount 2 via the vise grip wrench 10 in order to be connected in the drilling axis 26 with the existing drill string this vise grip wrench 10 is shown in an enlarged version in fig4 which is a special version of the picture in fig2 differentiated by the fact that the clamping cylinders 31 32 are located parallel next to each other nevertheless this design can safely hold and fasten the respective exterior tube 8 or interior tube 9 because the clamping cylinder 32 is equipped with a deviating device 33 this makes it possible to safely fasten the respective tubes 8 9 with these cylinders by moving the clamping jaws 34 35 against each other the clamping cylinder 32 therefore has an elbow 36 which is first connected with the piston 37 and second carries the clamping jaw 34 on the opposite side overstressing of the clamping cylinder 32 is prevented by connecting the elbow 36 with the piston 37 via a pin 39 and thus via a joint 38 elongated holes are provided for in the angle arc 40 guaranteeing exact guidance of the elbow 36 during insertion or removal of the piston 37 the piston surface 42 and the ring surface 43 on the clamping cylinders 31 32 are designed in such a way that synchronism of both clamping cylinders 31.