Clock Pendulums and Pendulum Accessories › Heavy-Duty Rating Assembly for Regulator Clocks Image 1 of 1 Heavy-Duty Rating Assembly for Regulator Clocks $10.95 Heavy-Duty Rating Assembly for regulator clocks which use a heavy pendulum bob and require a large flat for the edge of the bob to rest on. Includes a pair of rivets for mounting Quantity: Add To Cart Added! Heavy-Duty Rating Assembly for regulator clocks which use a heavy pendulum bob and require a large flat for the edge of the bob to rest on. Includes a pair of rivets for mounting