As a result of the loss of the initial shape, loosening and sagging loops, there are problems with the closing of the window. In this case, it is necessary to check the presence of a backlash in loops and replace the screws in the fasteners. In the presence of a backlash, it is better to install new loops. If the problem is the deformation of the frame itself, you should determine the place of the protruding part of the frame and sand it with sandpaper. The last step in the restoration of a wooden window will be the application of paint and varnishes.