Here is a non-Vex servo adapted for use with the Vex system.
In this case, it is a GWS S125 that allows >360 degrees of rotation. This allows me to pan a camera and distance sensor around a full 360 circle.
I haven’t measured the accuracy of the servo. I doubt that it can make one degree accuracy, since there are only 256 possible positions distributed around more than 360 degrees. It does ok for my purposes.
What’s nice is that with the shaft adapter, you are not limited to just the Vex motors and servos, you can choose one that is stronger, or faster, or turns farther, or whatever.