A nut (100, 200, 300, 400, 500, 600) for linear movement along a lead screw, the nut (100, 200, 300, 400, 500, 600) comprising: a base (110, 210, 310, 410, 510, 610); a plurality of flexible fingers (112, 212, 312, 412, 512, 612) joined to the base (110, 210, 310, 410, 510, 610) and extending axially from the base between a fixed end joined to the base (110, 210, 310, 410, 510, 610) and a free end; at least one radial compression member (114, 214, 314, 414, 514, 614) defining an opening and having the plurality of flexible fingers (112, 212, 312, 412, 512, 612) extending through the opening; and an axial locator structure (116, 216, 316, 416, 516, 616) formed by at least a portion of an outer surface of the flexible fingers (112, 212, 312, 412, 512, 612), the axial locator structure is at least one circumferential groove (116, 216, 316, 416, 516, 616) and the at least one radial compression member (114, 214, 314, 414, 514, 614) is located within the groove (116, 216, 316, 416, 516, 616), each flexible finger (112, 212, 312, 412, 512, 612) defining a portion of the circumferential groove (116, 216, 316, 416, 516, 616) the at least one radial compression member (114, 214, 314, 414, 514, 614) being installed proximate the axial locator structure (116, 216, 316, 416, 516, 616) to apply a radially inward directed compressive force to the plurality of flexible fingers (112, 212, 312, 412, 512, 612), characterized in that the at least one circumferential groove (116, 216, 316, 416, 516, 616) includes a first circumferential groove (116, 216, 316, 416, 516, 616) and a second circumferential groove (116, 216, 316, 416, 516, 616) where the first circumferential groove (116, 216, 316, 416, 516, 616) has a first bottom surface having a first diameter and the second circumferential groove (116, 216, 316, 416, 516, 616) has a second bottom surface having a second diameter, the second diameter being different than the first diameter. a base (110, 210, 310, 410, 510, 610); a plurality of flexible fingers (112, 212, 312, 412, 512, 612) joined to the base (110, 210, 310, 410, 510, 610) and extending axially from the base between a fixed end joined to the base (110, 210, 310, 410, 510, 610) and a free end; at least one radial compression member (114, 214, 314, 414, 514, 614) defining an opening and having the plurality of flexible fingers (112, 212, 312, 412, 512, 612) extending through the opening; and an axial locator structure (116, 216, 316, 416, 516, 616) formed by at least a portion of an outer surface of the flexible fingers (112, 212, 312, 412, 512, 612), the axial locator structure is at least one circumferential groove (116, 216, 316, 416, 516, 616) and the at least one radial compression member (114, 214, 314, 414, 514, 614) is located within the groove (116, 216, 316, 416, 516, 616), each flexible finger (112, 212, 312, 412, 512, 612) defining a portion of the circumferential groove (116, 216, 316, 416, 516, 616) the at least one radial compression member (114, 214, 314, 414, 514, 614) being installed proximate the axial locator structure (116, 216, 316, 416, 516, 616) to apply a radially inward directed compressive force to the plurality of flexible fingers (112, 212, 312, 412, 512, 612), characterized in that the at least one circumferential groove (116, 216, 316, 416, 516, 616) includes a first circumferential groove (116, 216, 316, 416, 516, 616) and a second circumferential groove (116, 216, 316, 416, 516, 616) where the first circumferential groove (116, 216, 316, 416, 516, 616) has a first bottom surface having a first diameter and the second circumferential groove (116, 216, 316, 416, 516, 616) has a second bottom surface having a second diameter, the second diameter being different than the first diameter.