I am working on a hobby project. I need 2 perfectly spherical, perfectly balanced, pure metal (ie. pure titanium, aluminum, etc.) balls made, and then I need one (the larger one) to be precisely drilled through the center. It is essential that everything is done in an extremely accurate manner. I don't really know of any places to look or even get started. I am no professional engineer, but I am a chemistry major with minors in math and physics and specialization in thermodynamics that loves to tinker. However, most metal fabricators don't have the means to be quite as accurate as I need them to, at least the ones I have looked at. Any help is, as always, appreciated and thank you for your time.