Probably one of the earliest forms of the screw-head was that now in common use in jack-screws, perforated; the nut being flxed,and the wrench being a simple lever thrust into the perforatifin.

Working with a torque wrench can drastically reduce the chance of damaging any parts on your bike or having them come loose while riding. A torque wrench is a tool that allows you to tighten all ...