Auxiliary tool to be employed when positioning elements, whereby the auxiliary tool comprises a plurality of inflatable air cushion members made of a strong and flexible respectively bendable, but substantially unstretchable material, which through a hose member is connected to an inflating device as well as a bleeding valve, and whereby each of the air cushion members is a flat bag unit, which exhibits mutually opposingly arranged flat bag sides, wherein the auxiliary tool further comprises at least one connecting element (42, 44, 46, 50, 76, 90, 96) to the mutual fixation of a first of the air cushion members to one or more further of the plurality of air cushion members adjacent to the first air cushion member for providing the auxiliary tool with two or more mutually fixated air cushion members which are placed in a side by side relationship in a common plane so that the flat bag unit sides of the air cushion members together provide opposing sides within the auxiliary tool; wherein the flat bag unit sides are composed of layers of the mentioned material placed face to face and being joined along their free edges to form reinforced double layer edges (4, 22); characterized in that the two or more mutually fixated air cushion members are selectively inflatable and the auxiliary tool is further characterized by A or B, or C, wherein A) the auxiliary tool is further characterized in that the reinforced double layer edges (4, 22) form protruding edge flanges which at at least one corner comprises a hole or opening, and that the at least one connecting element (42, 90) comprises at least one pin member (50, 94) for engaging the mentioned at least one hole or opening; B) the auxiliary tool is further characterized in that the connecting element is comprised of a substantially flat frame structure comprising frame side units which are provided with openings within which the air cushion members become arranged, so that these are protruding out over just one of the side surfaces belonging to the frame structure; the frame structure is shaped comprising a number of frame portions comprising connecting members (46, 48) which cooperate to connect the frame portions to a coherent frame structure; and that the connecting members are releasable connecting members; C) the auxiliary tool is further characterized in that the at least one connecting element is manufactured of a coherent tissue within which a number of pockets are provided whereby each pocket serves to occupy an air cushion member, and in that each pocket serves to the fixation of an air cushion member in relation to one or more adjacent air cushion members which are being positioned within one or more of the adjacent pockets, and which pockets may be provided as being arranged on one or on both sides of the tissue. A) the auxiliary tool is further characterized in that the reinforced double layer edges (4, 22) form protruding edge flanges which at at least one corner comprises a hole or opening, and that the at least one connecting element (42, 90) comprises at least one pin member (50, 94) for engaging the mentioned at least one hole or opening; B) the auxiliary tool is further characterized in that the connecting element is comprised of a substantially flat frame structure comprising frame side units which are provided with openings within which the air cushion members become arranged, so that these are protruding out over just one of the side surfaces belonging to the frame structure; the frame structure is shaped comprising a number of frame portions comprising connecting members (46, 48) which cooperate to connect the frame portions to a coherent frame structure; and that the connecting members are releasable connecting members; C) the auxiliary tool is further characterized in that the at least one connecting element is manufactured of a coherent tissue within which a number of pockets are provided whereby each pocket serves to occupy an air cushion member, and in that each pocket serves to the fixation of an air cushion member in relation to one or more adjacent air cushion members which are being positioned within one or more of the adjacent pockets, and which pockets may be provided as being arranged on one or on both sides of the tissue.