Lenovo E41-80 Hardware Maintenance Manual page 72

Remove one screw 2 and three screws
Remove one screw 2 and four screws
Step Screw (quantity)
2
M2 × 5mm, flat-headed, nylon-coated (1) (E41)
M2 × 6mm, flat-headed, nylon-coated (1) (E51)
3
M2.5 × 6mm, flat-headed, nylon-coated (3) (E41)
M2.5 × 4mm, flat-headed, nylon-coated (4) (E51)
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Hardware Maintenance Manual
3 .
3 .
Color Torque
Silver 1.85 +/- 0.15kgf-cm
Black 1.85 +/- 0.15kgf-cm
Black 3.0 +/- 0.3kgf-cm
Silver 3.0 +/- 0.3kgf-cm