Thanks for the code, i'll try this shortly, the microseconds seem interesting. and Yes, I was using the servo library.
The "transformer" i referred to is the SAME battery powering the Arduino. on 3 of the servos (when they were plugged in, they aren't now), i plugged them in to 5v and ground on the arduino.
on the other 3, I took a small 12v --> 5v converter, and connected that to the same lead acid battery, but regardless of where I plug in the shoulder servos (arduino or transformer), they twitch.
A recent discovery I had though, was if I took an external power supply and connected them, I can power it from 4.7 all the way to about 5.2 and it will not twitch; at 5.2 and above it twitches. a lot. and increasingly so.
What would make these servos so shy of power?
btw. is transformer the right word?
Thanks