[. . . ] As you proceed with the installation of Model 1702EML Outside Quick Release, refer to door types shown in Figures A, B, C and D: Figure D: Canopy and one-piece door with horizontal and vertical track with "The Chamberlain Arm" installed cable loop (2) over one pin of the master link outside bar (3) as shown. [. . . ] The outer trolley will disconnect from the inner trolley so the door can be opened manually. Figure A: One-piece door with horizontal track only Figure B: One-piece door without track Figure C: Sectional Door with curved track Locate the Quick Release on the outside of your garage door (2). For doors A, B and C, center the Quick Release (1) below the opener door bracket (3). for door style D , locate Quick Release (1) approximately 10cm on either side of the door's centerline. For one-piece doors without track (B), position lock 35-60cm below top of door. For all other door types (A, C and D), position the lock 50-75cm below the top of the door (refer to illustrations). [. . . ] NOTE: On a metal door, the template must be positioned so that all the drilled holes will pass through the inside reinforcement stile of the door, if possible. [. . . ]