Hydraulic Valve
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industrial manifold standard
D03
casting
lost wax idea
https://docs.google.com/open?id=0BwxMMqGvwTM-R0ZTanl5dGctLTQ
two molds. inner and outer. sand and plaster? make outer mold. fill and cure 3d printed inner mold. insert into outer mold. pour alum(?) in and melt abs. mill bottom flat. mill hole through spool area. tap ends to attach solenoids.