an improved force feeder chain assembly including a force drive chain assembly on a conventional combine harvester apparatus and having a force feed slat assembly mounted thereon . the force feed slat assembly includes a plurality of elongated slat members for rotation on the force drive chain assembly for conventional harvesting operation . the force feed slat assembly includes a self - lubricating stripper insert member easily assembled and disassembled on respective elongated slat members for conversion of the force feed slat assembly from normal harvesting operations for use in a grain stripper harvesting operation . the force feed slat assembly with the stripper insert member thereon is easily and economically converted so as to be usable for all harvesting of crops , including the method of grain stripping utilized on a grain stripper combine harvester apparatus . the stripper insert members reduce friction and , thus , wear on the combine harvester apparatus and substantially lessens damage to the grain heads being harvested .