activation passage 33 are in fluid communication because it is necessary to position cartridge valve 30 correctly in bore 31 to insure proper alignment of the passages adjustment screw 40 is threaded through contact plate 23 and engages cartridge valve 30 it will be readily apparent from fig5 a and 5 b how the advancing or backing out of adjustment screw 40 will align seals 36 and apertures 35 for proper operation of cartridge valve 30 while fig3 illustrates a housing 20 formed separately from body 3 an alternate embodiment seen if fig4 incorporates housing 20 into body 3 in fig4 body 3 has been considerably cut down and is fixed to cylinder 5 by a connector 43 connector 43 is shown as simply a plate with screw apertures to engage cylinder 4 and body 3 of course connector 43 could be any means for securely fixing cylinder 5 relative to body 3 it will be clear to those skilled in the art that a housing 20 can be formed in body 3 by drilling out a bore 31 and passages 32 33 and 34 similar to that seen in fig5 a and 5 b contact plate 23 shown in fig4 will slide over the outer edge of body 3 housing 20 exactly as seen in fig5 a and 5 b while not shown in fig4 a small slot will be formed in body 3 adjacent to.