Ricoh D146 Service Manual page 198

22. Slide the finisher [A] along the rail of the bottom plate from the left-hand side of the machine
to attach it ( ×1).
23. Attach the left rear cover.
24. Insert the upper left cover [A] from the front, and slide it to attach it.
25. Attach stabilizers [A].
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Because the weight is biased to the right of the machine if the inner finisher is
installed, anti-tip components are required on the left side. Because they are
included with the finisher, install these components at the same time as you install
SM 2-127 D146/D147/D148/D149/D150
Internal Finisher SR3130