The rail can not stretch so hard that they no longer slip in the transverse direction. There is no lack of power, but that comes probably by the movable jaws, which allow a clamping in the state slightly bent. This means that straight cuts that require a little more leadership not possible (threading a jigsaw etc.). In short, this device creates with me more problems than it solves. A batten as a guide has the same effect, even work better. For clamping flat workpieces, the rail is also suitable as described.
