Its spring loaded, and a right so and so to get to. just unscew the centre bolt, take out the adjuster and springs push the udjuster back into it housing (I has a ratchet underside and dont loose the two springs that are inside the ratchet body, the small spring goes inside the large one. The difficult bit is putting the centre bolt that adjusts the tension back into the body, its best to use a socket for this as you can put more pressure onto the bolt that way