shaped such that the inner portion 131 of the channel 126 closest to the bolt hole 122 has a larger width than the outer portion 133 of the channel 126 adjacent the side surface 135 of the hub 120 in addition and as explained in further detail below the interaction between the cavity 134 and the leg 140 improves the weight distribution between the hub 120 and the leg 140 thereby increasing the structural integrity of the interlocking interchangeable support base system 100 as will also be explained in greater detail below if the hub 120 is configured with the optional key recess 128 the hub key recess 128 works with a key recess 153 on the leg 140 to define a keyhole that is sized to receive a key 174 as shown in fig1 the key 174 creates a multi dimensional force 175 between the hub 120 and the leg 140 that tightens the connection therebetween of course a person of ordinary skill in the art will appreciate that the interlocking interchangeable support base system 100 includes embodiments of the hub 120 not specifically illustrated or described herein for example the hub 120 can be shaped in alternative shapes such as oval.