Ball fastening:

1. To install the ball in mechanism push the lever down till resistance as show figure 2.

2. Slip the ball into body in this way so pins if the ball will be in nests of the body.

3. Let go the lever. It should return to initial position, this means correctly installed ball in the mechanism.

4. Put safety pin through lever's hole and bracket's hole. Correctly placed safety pin show figures 3 and 3a.
 

Ball unfastening:

1. To unfasten the ball take out the safety pin.

2. Push the lever down till resistance.

3. With fast move take out the ball. Let go the lever. It should return to initial position.

4. Put plug into the body. Plugs are in accessories of the towbar with quickly demountable ending.