the adjusters on my tektro side-pulls work very simply. if there's too much slack in the cable, the barrel may be adjusted to move the end of the housing away from the brake. that's all it does. moving the end of the housing moves the total length of housing away from the brake, thus pulling all the cable with it. pulling the cable away from thr brake pulls the calipers closer to the rim. are there other types of adjusters?