Having an adjustment to the watches and clocks is an extremely important work after finishing the mechanical watches and clocks installation, because it is a key step to guarantee the accuracy and reliability of the watches and clocks. Early retro pocket watches mainly used the way of balance wheel screw adjustment to adjust the travel time, while it generally needed to adjust the two screws counterweights of the corresponding positions with the same amplitudes at the same time. Retro trend set off and developed more and more quickly nowadays, people's preferences for retro items are also rising, it means that such retro pocket watches, which adjusts the travel time of the pocket watches with screw counterweights, will be more and more popular, the use of tungsten alloy screw counterweights will also immediately expand.

 

As we all know, the travel time standard of watches and clocks is determined by adjusting and controlling the swing amplitudes, so as to ensure the accuracy of the watch, the first step should be to ensure the swing amplitudes of the balance wheel (the ideal swing amplitudes should be at the range of 270 to 320). Swing amplitudes refer to the swing and rotation angle of balance wheel, which pushed by the spring gossamer. It does not meet the technical requirements if the swing amplitudes are too large or too small, because it will seriously affect the accuracy of travel time and even affect the using reliability of the watches and clocks. One way to adjust the swing speed is to adjust the speed needle, and the other is to adjust the balance wheel counterweights. The adjustment of balance wheel counterweights mainly rely on tungsten screw counterweights, in order to balance the swing inertia, thus to precisely adjust the screw counterweights to control the swing amplitudes in an ideal range, so as to achieve the aims of ensuring the travel time accuracy of the watches and clocks.