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Old 09-09-10, 10:16 AM
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BCRider
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From your description "rattle" is the rachet mech in the head.

And yeah, sticking the square drive in a vise or on a car lug nut and playing with it first is a darn good idea. The click on my own torque wrench can be quite soft to hear and feel at lower torque ranges and hellishly sharp at the higher end. 5Nm is only 3.7 ft-lbs and very near the low end of your operating range. So it's likely going to be quite a soft click. All the more reason to play with it clamped or onto something that won't move so you can learn to feel the click of the wrench.
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