IBM R31 - Manual (Page 126)

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Step Size (Quantity) Color Torque
2 M2 x L6 (3) Silver 1.6 kgf-cm
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Note: Before removing and replacing the PCMCIA holder,
make sure that the PCMCIA cards are removed and
the eject levers are sticking out.
120 ThinkPad R30/R31 HMM