A positioner apparatus comprising: - a cylinder; - a first movable component and a second movable component established in or as a portion of an end of said cylinder, wherein said first movable component is a first piston or a cylinder end portion and wherein said second movable component is a second piston or a cylinder end portion; - an elastic element established within said cylinder so as to effect an elastic force against said second movable component; - a releasable, securable position adjustment mechanism configured to selectively lock said first movable component via a retainer mechanism that locks said first movable component into a desired one of at least two discrete stationary first movable component positions at a first movable component movement resolution, wherein said resolution inversely relates to the distance between the different available positions for the first movable component, i.e. it may be viewed as being directly related to the "closeness" of such positions; the closer they are, the higher or greater the resolution and wherein said retainer mechanism is obstacle and spring, obstacle and controlled source of pneumatic force, a shuttle mechanism or a ratchet system; - a pneumatic, second movable component force applier, including a pneumatic source of pressurized air and a control system to control the pressure applied, and configured to apply a second movable component force that acts against said elastic force so as to move said second movable component at a second movable component movement resolution, wherein said resolution inversely relates to the distance between the different available positions for the second movable component, i.e. it may be viewed as being directly related to the "closeness" of such positions; the closer they are, the higher or greater the resolution; and - a positioner that is positionally responsive to said second movable component such that it moves identically with the second movable component, wherein said second movable component movement resolution is greater than said first movable component movement resolution, i.e. the average distance between the possible positions of the second movable component is, in value, smaller than the average distance between the possible positions of the first movable component; characterized in that said elastic element is established between the first movable component and the second movable component and in that movement of said second movable component will not effect movement of said first movable component when said first movable component is locked in said desired position. - a cylinder; - a first movable component and a second movable component established in or as a portion of an end of said cylinder, wherein said first movable component is a first piston or a cylinder end portion and wherein said second movable component is a second piston or a cylinder end portion; - an elastic element established within said cylinder so as to effect an elastic force against said second movable component; - a releasable, securable position adjustment mechanism configured to selectively lock said first movable component via a retainer mechanism that locks said first movable component into a desired one of at least two discrete stationary first movable component positions at a first movable component movement resolution, wherein said resolution inversely relates to the distance between the different available positions for the first movable component, i.e. it may be viewed as being directly related to the "closeness" of such positions; the closer they are, the higher or greater the resolution and wherein said retainer mechanism is obstacle and spring, obstacle and controlled source of pneumatic force, a shuttle mechanism or a ratchet system; - a pneumatic, second movable component force applier, including a pneumatic source of pressurized air and a control system to control the pressure applied, and configured to apply a second movable component force that acts against said elastic force so as to move said second movable component at a second movable component movement resolution, wherein said resolution inversely relates to the distance between the different available positions for the second movable component, i.e. it may be viewed as being directly related to the "closeness" of such positions; the closer they are, the higher or greater the resolution; and - a positioner that is positionally responsive to said second movable component such that it moves identically with the second movable component, wherein said second movable component movement resolution is greater than said first movable component movement resolution, i.e. the average distance between the possible positions of the second movable component is, in value, smaller than the average distance between the possible positions of the first movable component;