Stanley RD2068R 4 x 4 4 Single Acting, Full Mortise, Standard Weight Spring Hinge - 4" x 4", 5/8" Radius Corners, Satin Brass
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and specifically you are looking at figure 2 which is a combination of both inserting the ranch and depressing it in a downward motion while permitting it to release in a counter-clockwise fashion assuming the tension collar is pointed towards the top of the door.
I also demonstrate the procedure in the video as seen here: Click Here