Dell 2135cn Service Manual page 640

Chapter 3 Removal and Replacement Procedures (RRPs)
Replacement 1 KIT COUNTER BALANCE (PL10.10.99)
1) Mate the two holes of the COUNTER
BALANCE R with the bosses of the ADF
ASSY, attach the COUNTER BALANCE R.
2) Secure the COUNTER BALANCE R to
the ADF ASSY with the one screw (silver,
tap, 8mm).
3) Mate the two holes of the COUNTER
BALANCE L with the bosses of the ADF
ASSY, attach the COUNTER BALANCE L.
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Version 1 2008.02.01