Stupid question, but a search brought up nothing- Polyurethane bushing question
 

With Polyurethane bushings, or any suspension bushing in general (On the A-arms), do the eccentric bolts "crush" the metal sleeve, leaving the polyurethane bushing to spin around the sleeve?

The reason I ask- the previous owner installed a set of these bushings on the car and they are VERY stiff, and squeak constantly (only worried about them being hard to move, could care less about squeeking) . I'm thinking about putting Zerk fittings in the A-arms to allow a quick and simple greasing so the suspension can do its job correctly again.

Any insight?

*EDIT*

More Google searching brought Emilio at 949racing to the rescue!

Installing Zerk fittings

I've been zerking my install. The center metal bushing rotates, the poly parts are static.

Installing Zerk fittings