IBM 310ED - Manual (Page 82)

Note: Make sure you use the correct screw when
replacing.
Step Size
(Quantity) Head and
Color Memo
3
M2.5 x 6L (2) Pan head,
black w/ nylock
paste
4
M2 x 4L (2) Pan head,
silver
58 IBM Mobile Systems ThinkPad 310 (D/E/ED) HMM