Screws

[karotlopj]

Does anyone know of any cross reference for different screws used on ThinkPads?

I have lots of loose screws around the place and can't remember where they all go. There doesn't seem to be that many different types although lengths vary for certain types. On the back of my T42 there is a diagram showing three different lengths with a key - 1,2,3 and quite a lot of the screw holes are marked with the relevant key, which I thought was a great idea, but haven't seen this on other models.