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Posted to rec.crafts.metalworking
Richard Smith[_4_] Richard Smith[_4_] is offline
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Default hydraulic valve - opens on set pressure, closes no pressure

... Modifying the rods into pistons and making packing glands to
retain the seals are lathe operations. ...

I took it a lathe would be available.
Cylindrical "spud", cylindrical bush.

Maybe the "hydraulic fluid" could be grease - thick - tranmitting to
oil or water through a rubber membrane. So the piston/bush sees
viscous grease not thin oil.