Pump jack crank

An apparatus for cranking a shackle of a pump jack comprising:

• a shaft which fits through the shackle of the pump jack;
• an arm rotatably attached to the shaft;
• a handle for cranking the shaft, the handle having a locked state in which the handle is unable to rotate the shaft, and an unlocked state in which the handle is able to rotate the shaft, the handle attached to the arm;
• and
• a locking mechanism engaging the arm at a pivot point and the shaft, the locking mechanism placing the handle in the locked state or the unlocked state by moving the handle about the pivot point to a first position or a second position, respectively, the locking mechanism includes a pin which holds the arm to the shaft, the pin extending into the shaft and arm, the locking mechanism having a first axis corresponding to a long axis of the shaft, and a second axis which corresponds to a long axis of the pin, when the handle is rotated about the first axis, the handle causes the shaft to rotate with the handle, when the handle is turned about the second axis, the shaft does not rotate, the locking mechanism includes a spacer, a spring, and a collar that are a sliding fit over the shaft, the collar has fingers, and the arm has two legs, with the fingers on the collar fitting between the legs.