The piston rods are bored from the top flange to a point opposite the center of the crosshead. Though this bore, a long pipe is inserted which goes nearly to the bottom of the bore. The outside diameter of the pipe is less than the diameter of the bore, the result being that an annular space is formed between the piston rod and the pipe.
The lower end of the piston rod is reduced in diameter to fit a bore in the crosshead, this being secured to the piston rod by a nut. The piston rods are provided with dowel pins to ensure the correct assembly of the components.

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