I need to make a device that can move two small servos within 0.01 or less degree rotation (yes, degrees, not radians!). Currently, everthing I've seen comes up greater than half a degree. It must have position feedback (stepper without encoder won't work), and the whole thing must fit in a 1/2"x6" tube. It only needs to move maybe 30-40oz-in, but will always have that load (so backlash isn't a huge issue, but still should be minimal). A COTS device is best, but it can be homemade, preferably under $50 or so, maybe up to $100 max. It doesn't need to move fast or continuously, maybe 90 in 0.5 seconds. It will be run by a microcontroller with a lot of IO pins, and PID control. Any ideas, products or anything would be great, Thanks in advance.