An adjustable support arm utilizing an elastomeric member having a dynamic attachment point to support the weight of an attached object. The adjustable support arm can include a lower bracket that is connected to an upper bracket by an upper arm and a lower arm. The elastomeric member counterbalances the weight of an attached object. The first end of the elastomeric member can be attached to a linkage, which can include a first, second, and third link and the second end of the elastomeric member can be attached to one of the arms. The links can be coupled to each other between the upper and lower arms such that the linkage is dynamically moveable upon movement of the support arm.