Dell 2135cn Service Manual page 641

Chapter 3 Removal and Replacement Procedures (RRPs)
4) Secure the COUNTER BALANCE L to
the ADF ASSY with the four screws (silver,
tap, 8mm).
Go to the next replacement step:
Replacement 61 ADF ASSY (PL10.10.1)
3 - 139
Version 3 2008.06.13