A golf club, comprising: a golf club head having an interior chamber configured to receive an insertable shaft adapter, the interior chamber comprising: a receiving mechanism proximate to an exterior portion of the golf club head configured to releasably receive and secure a shaft retainer; and a rotation inhibiting structure with an outer perimeter having a cross-sectional shape of a regular polygon; a shaft adapter comprising an axial direction change region, the shaft adapter further having an upper end and a lower end, wherein the upper end is configured to engage a golf club shaft and the lower end comprises a rotation inhibiting structure configured to engage or mate with at least a portion of the outer perimeter of the rotation inhibiting structure of the golf club head to prevent rotation of the shaft adapter in relation to the club head, wherein the shaft adapter fits within the interior chamber of the golf club head at a plurality of different configurations, wherein at least one configuration provides different club characteristics than another configuration; and a shaft retainer having an inner perimeter and an outer perimeter, wherein the inner perimeter is configured to slide axially over the upper end of the shaft adapter and the outer perimeter is configured to be releasably secured by the receiving mechanism of the club head. a golf club head having an interior chamber configured to receive an insertable shaft adapter, the interior chamber comprising: a receiving mechanism proximate to an exterior portion of the golf club head configured to releasably receive and secure a shaft retainer; and a rotation inhibiting structure with an outer perimeter having a cross-sectional shape of a regular polygon; a shaft adapter comprising an axial direction change region, the shaft adapter further having an upper end and a lower end, wherein the upper end is configured to engage a golf club shaft and the lower end comprises a rotation inhibiting structure configured to engage or mate with at least a portion of the outer perimeter of the rotation inhibiting structure of the golf club head to prevent rotation of the shaft adapter in relation to the club head, wherein the shaft adapter fits within the interior chamber of the golf club head at a plurality of different configurations, wherein at least one configuration provides different club characteristics than another configuration; and a shaft retainer having an inner perimeter and an outer perimeter, wherein the inner perimeter is configured to slide axially over the upper end of the shaft adapter and the outer perimeter is configured to be releasably secured by the receiving mechanism of the club head. a receiving mechanism proximate to an exterior portion of the golf club head configured to releasably receive and secure a shaft retainer; and a rotation inhibiting structure with an outer perimeter having a cross-sectional shape of a regular polygon; a shaft adapter comprising an axial direction change region, the shaft adapter further having an upper end and a lower end, wherein the upper end is configured to engage a golf club shaft and the lower end comprises a rotation inhibiting structure configured to engage or mate with at least a portion of the outer perimeter of the rotation inhibiting structure of the golf club head to prevent rotation of the shaft adapter in relation to the club head, wherein the shaft adapter fits within the interior chamber of the golf club head at a plurality of different configurations, wherein at least one configuration provides different club characteristics than another configuration; and a shaft retainer having an inner perimeter and an outer perimeter, wherein the inner perimeter is configured to slide axially over the upper end of the shaft adapter and the outer perimeter is configured to be releasably secured by the receiving mechanism of the club head.