(a) Seesaws without spring centering devices shall have shock-absorbing materials, such as partial tires:

1. (1) Embedded in the ground underneath the seats; or
2. (2) Secured to the underside of the seats.

(b) Hand holds:

1. (1) Shall be provided for both hands at each seating position; and
2. (2) Shall not turn when grasped.