Abstract: A horizontally elongated body is provided including a top face, a bottom face and a vertical dimension. A downwardly opening recess is formed in the bottom face and a plurality of laterally spaced, upstanding and cylindrical shot bores are formed in the body and open upwardly through the top face and downwardly into the recess spaced from adjacent peripheral portions thereof. A plurality of patch embraced shot balls are frictionally downwardly wedged in the shot bores and are displacable axially therethrough.