Canon iR6570 Series Installation Procedure page 56

Chapter 1
8) Hook the claw [A] found at the tip on the long hole [B] of the machine; then, fit the cassette stay [1] in place.
Check to make sure that the claw [A] of the cassette stay is securely in place from the machine rear.
9) Secure the cassette stay [2] in place from the rear of the machine using 2 screws [1].
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[B]
[A]
[1]
F-1-103
[A]
[A]
F-1-104