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it's basically a kinematic degree-of-freedom problem. The t-rod and the FLCA form a planar link. In order for the link to be able to rotate about the FLCA bushing axis, the t-rod bushing axis must be given another degree of rotational freedom since the axes are not colinear. This 2nd degree of rotational freedom at the t-rod pivot comes either through a spherical bearing (adjustables) or through flexion (stock bushings). Again, I'm sure the ES bushings flex some, the question is whether or not that flexion is enough to prevent fatigue elsewhere. 
 "The more "F" and the less "m" you have, the more "a" you can get." -- Brian Beckman, The Physics of Racing |
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