Rotatable seat support

The applicant herein has contemporaneously filed a related application entitled Floating Roller Lock. A seat support having a clevis having an annular base and upper and lower arms rotatably mounted on and extending radially outward from the annular base; at least a first support column extending downwardly from the annular base; seat mounting ball bushings having at least a first laterally extending tongue, the at least first tongue being received by the clevis; and at least a first clevis pin attaching the at least first tongue to the clevis.