IBM R31 - Manual (Page 136)

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Step Size (Quantity) Color Torque
2 M2 x L4(2) Silver 2.5 kgf-cm
3 M2.5 x L6(2) Black 2.5 kgf-cm
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Note: When removing the LCD, take note of the following:
v Be careful not to scratch the LCD bezel when
removing the screw mylars.
130 ThinkPad R30/R31 HMM