US Patent 7112152 Hitting training aid

A training aid for use with an elongated sporting implement for hitting training is disclosed to include three vane devices injection-molded from plastics each vane device having a flat vane body and smoothly arched top and bottom locating plates disposed near top and bottom ends of the inner vertical side of the flat vane body for enabling the vane devices to be adjustably connected to one another around the sporting implement through a plug joint, and two fastening belts inserted through insertion slots in the flat vane body of each vane device and fastened up to affix the vane devices to the sporting implement. Top and bottom stop devices are attached when the training aid is used with a golf club.