US Patent 8206110 Horizontal wind turbine blade balancing accessory

A balancing assembly for use in a wind turbine having at least one pair set of blades, the balancing assembly comprising a ballast and a ballast receiving structure on at least one blade of the pair set of blades. The ballast provides a threaded portion for engagement with the ballast receiving structure. The ballast further provides at least one end configured with a drive socket for driving said ballast into said ballast receiving structure. The ballast is capable of being trimmed to achieve a predetermined mass necessary to achieve a balance between the blades in the pair set of blades.