How to Install Automatic Door Closer ( WITH SLIDE CHANNEL ) डोर क्लोजर कैसे लगाते हैं ?

Door Closer C071 ( WITH SLIDE CHANNEL ) डोर क्लोजर कैसे लगाते हैं ? door closer Kaise Lagate Hain Jali ke doors mein men Door mein automatic Door Se band hone Ka Tarika stopper door closer kis Prakar Lagana chahie is video ke Madhyam se aap Jankari