A golf club head/shaft connection assembly, comprising: a first cylindrical structure having a first end and a second end opposite the first end, wherein the first end includes a first opening that defines a cylindrical interior chamber for receiving a golf club shaft, wherein an exterior surface of the cylindrical structure nearer to the first end than the second end includes a first rotation-inhibiting structure, and wherein the second end includes a securing structure; a second cylindrical structure having a first end and a second end opposite the first end, wherein the first end defines an opening to a borehole for receiving the first cylindrical structure, wherein an interior surface of the second cylindrical structure nearer to the first end than the second end includes a second rotation-inhibiting structure, wherein an outer cylindrical surface of the second cylindrical structure extends in a first axial direction and the interior cylindrical surface of the borehole extends in a second axial direction that differs from the first axial direction, thereby creating a face angle offset or a lie angle offset for the second cylindrical structure, and further wherein the second cylindrical structure is reversible and orientable in two positions 180 degrees apart between: (i) an open face angle offset and a closed face angle offset; or (ii) an upright lie angle offset and a flat lie angle offset, and wherein the second end defines one or more notches or grooves to allow the second end to flare inward towards the center of the borehole; and a securing system for releasably engaging the securing structure. a first cylindrical structure having a first end and a second end opposite the first end, wherein the first end includes a first opening that defines a cylindrical interior chamber for receiving a golf club shaft, wherein an exterior surface of the cylindrical structure nearer to the first end than the second end includes a first rotation-inhibiting structure, and wherein the second end includes a securing structure; a second cylindrical structure having a first end and a second end opposite the first end, wherein the first end defines an opening to a borehole for receiving the first cylindrical structure, wherein an interior surface of the second cylindrical structure nearer to the first end than the second end includes a second rotation-inhibiting structure, wherein an outer cylindrical surface of the second cylindrical structure extends in a first axial direction and the interior cylindrical surface of the borehole extends in a second axial direction that differs from the first axial direction, thereby creating a face angle offset or a lie angle offset for the second cylindrical structure, and further wherein the second cylindrical structure is reversible and orientable in two positions 180 degrees apart between: (i) an open face angle offset and a closed face angle offset; or (ii) an upright lie angle offset and a flat lie angle offset, and wherein the second end defines one or more notches or grooves to allow the second end to flare inward towards the center of the borehole; and a securing system for releasably engaging the securing structure.