Materials commonly used are T8A or T10A, more than 50HRC hardened and surface finish requirements of 0.8 micron; fasten the H8 / f8. Plunger is detailed criteria diameter, length, different shapes.
The holes easily worked, so this system is quite simple to make. But for working long and precise circular hole is still difficult, so it is necessary to push key boring a hole measuring about certain length.
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