Rodney

Back in the 50's and 60's these were quite prominent. I assume these are the three wire ones (they also made 4 wire servos then). If so, they are most probably set up so that 1.2milliseconds is the neautral pulse width and have a 4 sided spline. They will work with modern equipment but; at neautral input, the output wheel will not be at right angles to the servo axis. You can correct this by opening the servos, loosen the screw that hold the potentiometer in place, and rotating the pot untill the output wheel is at right angles to the servo case when inputing a 1.5 millisecond input pulse (the neautral pulse on most modern transmitters). Then just tighten down the screw holding the pot in place and reassemble. These old servos may have some problems with dirty potentiometers though, so, if you can, use newer servos on the main channels. Reserve these for throttle or flaps.