IBM R31 - Manual (Page 185)

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Step Size (Quantity) Color Torque
2 M2.5 x L5(3) Silver 2.5 kgf-cm
Notes:
1. When removing the system board from the bottom
cover, gently raise the side of the system board facing
the rear I/O ports; then pull out the system board.
MT 2656, 2657, 2676 179