IBM R31 - Manual (Page 178)

Note: Release the gray cable, which is the main antenna
from the system.
4
4
5
Step Size (Quantity) Color Torque
4 M2.5 x L10 (4) Black 3.6 kgf-cm
5 M2.5 x L5 (1) Silver 2.5 kgf-cm
6
172 ThinkPad R30/R31 HMM