About this 3D model

Video- https://youtu.be/EM94MJLAkBo A remarkably simple and effective clamping system. Long (50 см) threaded rods screw into four corner blocks; the whole assembly is quickly closed up to the frame by sliding the speed nuts along the rods. A quick locking twist applies final pressure. Each corner is relieved with an inside channel to ensure that the mitre fits snugly.