pressure of 40 psi for opening pressure relief check valve 71 has been found to provide optimum results fixedly positioned workfluid reservoir 80 is located above gear cover 43 a 43 b and has an outer wall 82 and an inner wall 84 which surrounds the lower end portion of the column component 16 and the surrounding tubular support column 38 as best shown in fig1 a and fig3 a centrifugal water return pump 86 driven by electric motor 90 has an inlet connected by conduit 88 to the workfluid reservoir 80 for removing spent workfluid from reservoir 80 and pumping it through a filter 308 to a storage tank 330 as shown in fig8 workfluid in tank 330 is cooled to approximately 80 degrees fahrenheit by circulation through a heat exchanger 334 effected by operation of circulation pump 332 in circulation pump line 331 high pressure pump 336 is controlled by a manually adjustable relief valve 335 and a pressure transducer 333 connected to control circuitry in a power distribution and control enclosure 344 as shown in fig5 the workfluid is removed from tank 330 by high pressure pump 336 by operation of high pressure pump motor 337 and pumped into a high pressure delivery line 338 which is connected at its downstream end to water supply axial bore 29 in the support column as shown in fig1 b and 43 workfluid in bore 29 is subsequently delivered to plural workstations in a manner to be discussed below the upper end of the second level tubular support sleeve 62 supports a rotary mold support table.