You have to kind of tighten it until it clickes then "rock" on it and make sure it clicks again. 17 ft lbs is not very much at all especially with a long lever such as a torque wrech. Also, make sure you get it right between ft lbs and inch lbs. Torque wreches use a spring inside to work so over time they will wear out and not be accurate. Storing them set at a torque setting will also stress the spring...store it set to zero so the spring is not compressed.