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1. A method, comprising: inserting a machining tool through a hole of at least one workpiece, wherein the at least one workpiece includes a first surface and a second surface opposite the first surface, wherein the hole extends from the first surface to the second surface, wherein the hole forms an inner wall, wherein the machining tool includes: a shaft having a longitudinal axis and a first opening, and a cutting tip located proximate to one end of the shaft, wherein the cutting tip includes a first side and a second side opposite the first side, and a width extending from the first side to the second side, a first edge, a second edge opposite the first edge, a cutting portion, wherein the cutting portion includes a concave cutting surface extending towards the second edge from the first edge to a first location between the first edge and the second edge, wherein the concave cutting surface extends across an entirety of the width of the cutting tip, wherein the concave cutting surface includes an inner radius, wherein the first location extends linearly from the first side to the second side, wherein the concave cutting surface includes an inner radius that curves inwardly relative to the longitudinal axis, a first ramped portion, wherein the first ramped portion extends obliquely in a first direction relative to the longitudinal axis, wherein the first ramped portion extends from the second edge to a second location between the first edge and the second edge, and a second ramped portion, wherein the second ramped portion extends obliquely relative in a second direction relative to the longitudinal axis, wherein the second direction is different than the first direction, wherein the second ramped portion extends from the first location to the second location, wherein the cutting tip is configured to be retractable into the shaft of the machining tool in a retracted position at the first opening and configured to be extendable from the shaft in an extended position at the first opening, wherein during the inserting, the first ramped portion contacts the inner wall, thereby moving the cutting tip to the retracted position without cutting the first surface, positioning the cutting portion of the cutting tip to abut an edge of the at least one workpiece, wherein the edge of the at least one workpiece is located at a junction of the second surface and the inner wall; forming a surface modification at the edge with the cutting tip, wherein the surface modification has an outer radius corresponding to the inner radius of the concave cutting surface; removing the machining tool from the hole, wherein during the removing, the second ramped portion contacts the surface modification without cutting the surface modification; and installing a fastener within the hole, wherein the fastener engages the surface modification.
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