Abstract: An encoder having a special construction which includes a special tension spring which increases the life of the encoder. The tension spring has first and second "U"-shaped portions formed on one end thereof with the remaining end of the spring being secured to a frame of the encoder. The first "U"-shaped portion of the spring is positioned around a stud on a beam of the encoder, and the second "U"-shaped portion receives a portion of the beam. An actuator is used to move a hammer on the beam to an impact position, and the tension spring is used to return the beam to a home position. As the beam is moved toward the impact position, there is an increase in the area of contact between the stud and the first "U"-shaped portion to thereby minimize movement therebetween. When the spring returns to the home position, the body portion of the spring assumes an "arched" position which minimizes "bounce" of the beam in returning to the home position.