Method of elongating and relaxing a stud

A method of elongating and relaxing a stud having an axis and arranged in an object, the method comprising the steps of connecting the stud with a first part which is movable only in an axial direction so as to pull the stud in the axial direction to elongate the stud and thereby to tension it in the object or to relax the stud;

• moving the first part only in the axial direction by connecting the first part with a second part which is moveable in a transverse direction;
• connecting a friction element with the first part, so that the first part has more surfaces cooperating with other elements and subjectable to friction during movement than the second part and so that the second part is not connected with the friction element but instead is freely turnable relative to the friction element while freely abutting against the friction element;
• and applying a holding force to the first part via first engaging means at an end portion of the first part spaced from the friction element and simultaneously applying an opposite active force to the second part via second engaging means whereby the second part is moved in the transverse direction and the first part is moved in the axial direction to move the stud in the axial direction without turning so as to elongate the stud.