Remember with the the number of links involved, you don't want unintended movement. Rubber Bushing give a lot of movement, but they were installed by the factory because that was what was available & they were softer, so it gave a better ride.
Poly came along because they are stiffer, last longer & provide a more consistent precise movement.
Delrin is a step up from Poly as they are stronger & don't squeek as much
Spherical Bearings are Race oriented as they give razor sharp precision, but no comfort level
T.C.
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