Then the box is filled with mounting foam.

The second method is installation using foam. You need to assemble the box on the door leaf. The door is adjusted using the level, measured tape and wedges from wood. Then the box is filled with mounting foam. Then you need to wait a bit so that the foam dries one hundred percent, after which the loops are hung on the box. The gap according to the parish is usually made by the depth of the insertion of the loops, then the castle is installed. But this method has one obvious drawback, since the box may be deformed because the mounting foam with various humidity will change its properties (decrease or expand).