My sculptor wife has asked me to develop an electrical system for a kinetic sculpture that creates a 30 RPM movement at a whisper quiet level and yet fits into the palm of a hand. I'm looking at a 17mm diameter x 55 mm long mini-gearhead motor listed at "352:1 ratio that runs at 24 RPM @ 12 Vdc @ 22 mA, no-load specs". Am I on the right track in thinking this would be sufficient to move a weight less than 3 oz. a distance of 1 inch? I'm trying to mimic the back-and-forth/to-and-fro motion of a pendulum, similar to the speed of the pendulum of a grandfather clock. If you think this motor is too fast, what must I do to reduce the speed? Should I be looking at a DC motor (the slowest of which lists a staggering 7,000 RPMs)? Any input would be greatly appreciated!