Send power betwwen to moving parts?

[Archangel]

Whilst you can certainly use carbon brushes, they are typically used where high currents in the tens to hundreds of amps are required. A good example is the starter motor in a motor vehicle.

Huh, I've never seen a straight carbon brush in a starter, seen a copper blend there, alternators however do use carbon brushes. The brushes I am refering to are very small round or square light motor brushes designed to handle less than 10 amps and are soft enough to run on a copper surface without destroying it . They have the desirable attribute of having a fine braided copper wire embedded so as to give you a way to energize them without adding another friction connection. Many also have an attached coil spring. Example from OSH http://www.osh.com/eng/product/dreme...rushes/6067128
or better, Grainger's
http://www.grainger.com/Grainger/wwg...FUvCtgodhk5KpA
Although the cheapest method might be to cannabalize a toy's motor.

Starter Motor Brushes
http://www.amazon.com/Ricks-Motorspo.../dp/B00230JUMY