An apparatus comprising: a first number of splines (206, 310, 610, 706, 1110, 1212, 1604, 1804) located near a first end (208, 710, 1204) of a first joint section (202, 302, 600, 702, 1104, 1202, 1302) the first number of splines disposed on a circumferential outer surface of the first joint section and extending in a first axial direction toward the first end and outwardly in a first radial direction from the circumferential outer surface, each of the first number of splines having a base (218, 402), a tip (220, 404, 1006), and a pair of flanks (222, 406) extending from the base to the tip wherein the pair of flanks forms an acute angle (224, 418); characterised in that: the apparatus further comprises a second number of splines (212, 314, 707, 1112, 1214, 1704, 1904) located near a second end (214, 712, 1208) of a second joint section (204, 304, 704, 1106, 1206, 1304), the second number of splines disposed on a circumferential inner surface of the second joint section, and extending in a second axial direction towards the second end, each of the second number of splines having a base (218, 502), a tip (220, 504, 1006), and a pair of flanks (222, 506) extending from the base to the tip wherein the pair of flanks forms an acute angle (224, 512); and wherein each of the first number of splines is configured to be received between adjacent pairs of splines in the second number of splines as the first end of the first joint section and the second end of the second joint section are joined together to form a connection (228, 300, 700, 1100, 1300, 1500) between the first joint section and the second joint section, wherein the tips of the first number of splines are spaced from the first end of the first joint section, which defines a first cylindrical portion with an outer surface (210, 414); and the tips of the second number of splines are spaced from the second end of the second joint section, which defines a second cylindrical portion with an inner surface, and wherein the second number of splines extend inwardly from the inner surface of the second cylindrical portion and inwardly in a second radial direction from the circumferential inner surface. a first number of splines (206, 310, 610, 706, 1110, 1212, 1604, 1804) located near a first end (208, 710, 1204) of a first joint section (202, 302, 600, 702, 1104, 1202, 1302) the first number of splines disposed on a circumferential outer surface of the first joint section and extending in a first axial direction toward the first end and outwardly in a first radial direction from the circumferential outer surface, each of the first number of splines having a base (218, 402), a tip (220, 404, 1006), and a pair of flanks (222, 406) extending from the base to the tip wherein the pair of flanks forms an acute angle (224, 418); the apparatus further comprises a second number of splines (212, 314, 707, 1112, 1214, 1704, 1904) located near a second end (214, 712, 1208) of a second joint section (204, 304, 704, 1106, 1206, 1304), the second number of splines disposed on a circumferential inner surface of the second joint section, and extending in a second axial direction towards the second end, each of the second number of splines having a base (218, 502), a tip (220, 504, 1006), and a pair of flanks (222, 506) extending from the base to the tip wherein the pair of flanks forms an acute angle (224, 512); and wherein each of the first number of splines is configured to be received between adjacent pairs of splines in the second number of splines as the first end of the first joint section and the second end of the second joint section are joined together to form a connection (228, 300, 700, 1100, 1300, 1500) between the first joint section and the second joint section, wherein the tips of the first number of splines are spaced from the first end of the first joint section, which defines a first cylindrical portion with an outer surface (210, 414); and the tips of the second number of splines are spaced from the second end of the second joint section, which defines a second cylindrical portion with an inner surface, and wherein the second number of splines extend inwardly from the inner surface of the second cylindrical portion and inwardly in a second radial direction from the circumferential inner surface.