Weld things?

[warder]

How do you weld stuff to things like vehicles? I know it has to do with the gravity gun. But I just noticed this, makes for more strategy, like adding armor to your buggy!

 

[WhiteZero]

You'll need the physgun (not the same as the Grav Gun) mod for that.
http://www.halflife2.net/forums/showthread.php?t=59760