Variable spring suspension brackets typically have a shape that is fan-shaped, centered around the main shaft neck. This shape allows the center of gravity to be far from the rotational axis, thereby enabling a smaller mass to achieve a greater balancing centrifugal force, which is beneficial for weight reduction. The structural type of the balancing block comes in two forms: one is integrated with the crankshaft; the other is made separately and then secured to the crank arm with screws.

After the crankshaft assembly is completed, due to inevitable errors in the machining and assembly process, significant unbalance may occur. To address this, balance testing is required, and adjustments are made by removing a portion of the balance mass on the left side, in order to control the degree of unbalance within the specified range. Therefore, during the use of the maintenance spring suspension bracket, it is advisable to avoid disturbing the balance mass to prevent any disruption of its balance condition.