if you're planing on using it for continuous rotation than you reconsider. if you took the servo apart, in the gearbox there would be a gear that is connected directly to a potentiometer. on that gear there is a pin than physically limits the rotation. and secondly, since it is connected to a potentiometer and it cant rotate continuously, that would also cause a problem to you. im not sure what youre planing on doing, but, there are a few ways to make the servo go round. there are videos that explain how to modify it:
take it apart, cut of the before mentioned pin on the gear, take out the pontetiometer, solder it out, solder a couple of resistors in its place, and that way you would get a motor that if you type in 90 degrees it would not turn, if 0 degrees than it would turn max speed in one direction and if 180 degrees max speed to a different direction. however if you need accuracy than i do not recommend this, because the dead stop would not be at 9 degrees, it would be slightly off. i tried building a robot like this and that was a disaster, it was immposible to sync two of those motors and each time i turned it on is spun at different speeds.
but if you have a h-bridge, you can simply solder off all the unnesecary electronics and a have a quality dc motor with a spare wire and a good gearbox. worked for me, still glad i did it.
but again im not sure what youre doing wth it so i dont know if this is of any use to you.