A tensioner for use with an architectural-structure covering including an operating element (e.g., a cord, a chain, or the like) is disclosed. The tensioner selectively securing a position of the operating element relative to the tensioner. In one embodiment, the tensioner includes a body, a slider, a bearing, and an optional biasing member. The body may include a first body member coupled to a second body member. The slider is movably positioned within the body between first and second positions to selectively enable movement of the operating element relative to the tensioner. The bearing includes a projection for coupling to the second body member to prevent the second body member from being decoupled from the first body member. In this manner, when the bearing is enclosed within the body, a user cannot readily open the body (e.g., a user cannot readily separate the first and second body members).