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What is a tie rod bolt pinch screw? And what is its purpose?

Pinch screw is normally provided at the foot of the engine cylinder jacket to stop the tie rod 
from vibrating during the normal service of the engine. 
The pinch screw is fitted at the antinodal point of the tie rod to limit its transverse vibration 
amplitude, thereby preventing its fracture due to vibrations. These can be arranged as a 
group of three screws positioned equilaterally at the antinodal point. Each screw consists of a  stud, which is hand tightened by screwing the outer sleeve and held in place by a lock nut 
which is tightened to a torque specified by the manufacturer.
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