I have to disagree with Kevin on a couple of points
"Once you go to rigid arms you really should go rubber or spherical. Rubber for comfort or spherical for precision. The Delrin in most spherical joints absorbs a little NVH, but rubber is king in that regard. Poly usually squeeks because of bind, not so much because of the material itself. Grease helps for a while until the twisting forces push it aside."
For Rigid Arms it would be Poly, Spherical or Rod Ends. Sure Rubber would give a more comfortable ride, but Rubber twists and initiates Bind. There are reason that no one in performance aftermarket parts uses Rubber. A properly greased Poly Bushing will not bind - squeeking comes from the Bushing being not lubricated & binding.
Delrin is a Hard Acetal Co-Polymer that needs to be milled and can be used as a Bushing when made out of the correct Grade Delrin. Spherical Bearings may or may not use a Poly Sleeve to absorb shock. Delrin being so hard would not do that
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