Abstract: A chain tensioner apparatus which has a blade spring received laterally into a slot in the side of an elongated plastic shoe. A shoe mounting bracket carries the shoe and includes a side wall which overlies the slot to retain the blade spring in position. One end of the shoe is pivotally connected to the bracket, and the opposite end is retained in position and permitted to shift relative to the pivoted end by a retaining tab spaced outwardly of the side wall of the bracket.