A driving mechanism (10, 210) for use in a fastener driving tool, said driving mechanism comprising: (a) a guide body (40, 240) that receives a fastener that is to be driven from an exit end of said driving mechanism; (b) a movable driver actuation device (32, 232); (c) an elongated driver member (90, 290) that is in mechanical communication with said movable driver actuation device at a first end of said driver member, said driver member having a second, opposite end that is sized and shaped to push a fastener from said exit end of the driving mechanism, said driver member having a direction of movement between a driven position and a ready position, said driver member having at least two longitudinal edges, said driver member having a plurality of spaced-apart protrusions (92, 292) along said at least two longitudinal edges; and (d) a lift mechanism which includes a lifter subassembly including a first rotatable disk (56, 263), said first otatable disk being keyed to a rotatable shaft (66, 266), said first rotatable disk having a first plurality of lifter pins (62, 68, 262, 268) extending from a surface of the first rotatable disk, (e) wherein, for moving said driver member from said driven position to said ready position: (i) said rotatable shaft (66, 266) rotates in a first direction, anc characterised in that the lifter subassembly includes a second rotatable disk (64, 264), said second rotatable disk (64, 264) being keyed to the rotatable shaft (66, 266), and said second rotatable disk (64, 264) having a second plurality of lifter pins (62, 68, 262, 268) extending from a surface of the second rotatable disk (64, 264), and wherein (ii) a rotational movement of both said first plurality of lifter pins (62, 68, 262, 268) and said second plurality of lifter pins (62, 68, 262, 268) engage with said plurality of spaced-apart protrusions (92, 292) along both of said at least two longitudinal edges, (iii) thereby substantially balancing mechanical loading forces during a return stroke from said driven position to said ready position. (a) a guide body (40, 240) that receives a fastener that is to be driven from an exit end of said driving mechanism; (b) a movable driver actuation device (32, 232); (c) an elongated driver member (90, 290) that is in mechanical communication with said movable driver actuation device at a first end of said driver member, said driver member having a second, opposite end that is sized and shaped to push a fastener from said exit end of the driving mechanism, said driver member having a direction of movement between a driven position and a ready position, said driver member having at least two longitudinal edges, said driver member having a plurality of spaced-apart protrusions (92, 292) along said at least two longitudinal edges; and (d) a lift mechanism which includes a lifter subassembly including a first rotatable disk (56, 263), said first otatable disk being keyed to a rotatable shaft (66, 266), said first rotatable disk having a first plurality of lifter pins (62, 68, 262, 268) extending from a surface of the first rotatable disk, (e) wherein, for moving said driver member from said driven position to said ready position: (i) said rotatable shaft (66, 266) rotates in a first direction, anc characterised in that the lifter subassembly includes a second rotatable disk (64, 264), said second rotatable disk (64, 264) being keyed to the rotatable shaft (66, 266), and said second rotatable disk (64, 264) having a second plurality of lifter pins (62, 68, 262, 268) extending from a surface of the second rotatable disk (64, 264), and wherein (ii) a rotational movement of both said first plurality of lifter pins (62, 68, 262, 268) and said second plurality of lifter pins (62, 68, 262, 268) engage with said plurality of spaced-apart protrusions (92, 292) along both of said at least two longitudinal edges, (iii) thereby substantially balancing mechanical loading forces during a return stroke from said driven position to said ready position. (i) said rotatable shaft (66, 266) rotates in a first direction, anc characterised in that the lifter subassembly includes a second rotatable disk (64, 264), said second rotatable disk (64, 264) being keyed to the rotatable shaft (66, 266), and said second rotatable disk (64, 264) having a second plurality of lifter pins (62, 68, 262, 268) extending from a surface of the second rotatable disk (64, 264), and wherein (ii) a rotational movement of both said first plurality of lifter pins (62, 68, 262, 268) and said second plurality of lifter pins (62, 68, 262, 268) engage with said plurality of spaced-apart protrusions (92, 292) along both of said at least two longitudinal edges, (iii) thereby substantially balancing mechanical loading forces during a return stroke from said driven position to said ready position.