Also keep in mind that the arduino servo commands using degree values is based on assumptions that your servo may not apply. The servo library assumes all servos are capable of moving a full 180 degrees and that may not be the case of your specific servo model. You should first just test sending a 0 degree command and marking that as one travel limit, then a 180 degree command and see how many actual degrees your servo can move using the servo library's min and max assumption values.