Canon Additional Finisher Tray-A1 Service Bulletin page 4

6) Remove the screw [1], and detach the slide guide
stopper [2]; then, slide the slide guide [3] upward to
detach. The removed slide guide stopper will not be
used later.
7) Before mounting the slide guide, which is
contained in the carton box, on the finisher, place
the lubricant (permanent lubricant G2) [1] at five
points on the slide guide and spread it over the slide
guide. (The locations for lubricant application are
indicated in [2] in the slide guide.)
8) Wipe off the extra lubricant with lint-free paper,
so that only a slight amount of lubricant is left on
the surface.
! If you fail to completely wipe off the extra
lubricant, it may adhere to copy paper.
9) Slide-in the slide guide from top to the finisher.
10) Peel off the liner from the double-faced tape [2]
adhered to the supplied slide guide stopper [1] at
two positions.
11) Using the screw (RS tight, M3 x 8) [3] removed
in step 6, install the slide guide stopper.
12) Mount the upper left cover, rear cover, and front
cover (in the case of the Finisher-Q1/R1) of the
finisher.