Corners made of two wooden battens, cut at an angle 45 the steps can be tightened and squeezed for the time of setting the glue with only three ordinary carpentry screw clamps and two wooden blocks. The figure shows how to clamp the blocks on the battens with two clamps and squeeze the whole thing with a third clamp. This method is designed for patches of typical sections used in household chores. Let's also remember, that in a well-equipped workshop you should have even and 10 clamps.
