Tightening several bolts together is ideal for the dispersion of the clamp load in all joints compared to tightening them one by one using a single tool. A multiple tightening system (with or without adjustable center distances) is a mechanical ideal solution to solve the relaxation issues in bolted joints compared if they are tightened one by one. By scanning the variant of the part to assemble, the spindles will be adjusted to the correct position to assemble the bolted joints.