Minibot material madness

[BaldGuy]

I that logic holds then you can buy aluminum pinions, and gears in various sizes with a set screw (HW is allowed), so as long as I can by the shape or form I can use it...Is htat what we are saying....?? Or do we have to make them out of alluminum we purchase (which would seem like a waste of time and money clearly not what the GDC intended)