a central bore 62 which has a pair of longitudinal key ways 63 and 64 which guide two pairs of pins 65 which prevent the turning of piston 61 with respect to steering column 66 a central bore 67 is intersected by two openings 68 and 69 and provide a restricted fluid passageway analogous to that described above instead of threading the outside of the piston the inside of the steering column could be threaded and the threads followed by thread followers 70 and 71 shown on the exterior of piston 72 in fig8 piston 72 has a central bore 73 and key ways 74 and 75 analogous to those shown in fig7 yet another possible combination is shown in exploded perspective view in fig9 where piston 76 has a threaded bore 77 in which thread followers 78 on steering column 79 ride like piston 13 piston 76 should have a key way 80 or other means for preventing the piston from turning when the steering column 79 is turned an approach not using a hollow piston is shown in fig1 where steering column housing 81 has a hollow cylindrical bore 82 to which a fixed vane 83 is welded or otherwise held a steering column 84 may be turned within steering column housing 81 and has a movable vane 85 welded or otherwise affixed thereto preferably movable vane 85 has a teflon seal 86 along its outer surface movable vane 85 divides the hollow cylindrical bore 82 into a first compartment 87 and a second compartment.