Patent ID: 8177487

Claim:
A system, comprising: a rotary machine, comprising: a rotary component comprising a groove having a base and first tapered sides converging toward one another in a first direction away from the base to form an opening; and a balance weight disposed in the groove, wherein the balance weight comprises a body, a first pair of balance weight tapered sides converging toward one another in the first direction and offset from one another by a first distance, and a second pair of balance weight tapered sides converging toward one another in the first direction and offset from one another by a second distance greater than the first distance; wherein each of the first pair of balance weight tapered sides comprises a flat section that extends approximately perpendicular to the base and that is configured to offset the first pair of balance weight tapered sides from one another by the first distance; and wherein the balance weight is configured to pass through the opening into the groove and rotate to engage the first tapered sides of the groove and the second pair of balance weight tapered sides.