I made tech gibs for the robots 2 weeks ago. Someone needs to texture them (i'm bad at that). I am sure that no one will texture them, however, due to a grudge against me.
Here is the GPL'd blender file:
https://cat2.optus.nu/cat2/nutsandbolts.blend
Gears (helical, spur, wish bone), nuts, bolts, capacitors, spring, pnumatic/hydrolic ram.
It's all there. I am sure, however, that it will not be textured solely due to the hatread the artists have for me and my social beliefs.
These are all centered correctly so that the "center" of each object is at the point of contact with the ground or (in the case where there are 2 copies (nuts and bolts)) the point where it would enter whatever it's being bolted into. All that needs to be done is: UVmap and export.
So, there are the tech gibs all ready for texture and then use, and they won't be in the game ever: I'm sure of it.