Abstract: A weight-adjustable-counterbalance apparatus includes a shell and at least one or more weighting member selectively added to the shell. The shell includes a container having an annular lateral wall and an end wall, and defines an opening at an end and a compartment. A first restrainer releasably fits on the end wall and in a manner being prevented from rotating relative to the container. A second restrainer releasably fits on the end of the container and in a manner being prevented from rotating relative to the container. A fastener releasably secures the first retainer, the container, and the second retainer together. The fastener has a first end retained on the first restrainer, a body inserting into the compartment, and a second end extending outside the opening and engaging with the second restrainer. The at least one or more weighting member is added by releasably fitting on the fastener.

Abstract: A weight-adjustable-counterbalance apparatus includes a shell and at least one or more weighting member selectively added to the shell. The shell includes a container having an annular lateral wall and an end wall, and defines an opening at an end and a compartment. A first restrainer releasably fits on the end wall and in a manner being prevented from rotating relative to the container. A second restrainer releasably fits on the end of the container and in a manner being prevented from rotating relative to the container. A fastener releasably secures the first retainer, the container, and the second retainer together. The fastener has a first end retained on the first restrainer, a body inserting into the compartment, and a second end extending outside the opening and engaging with the second restrainer. The at least one or more weighting member is added by releasably fitting on the fastener.