If your thinking of using the Heim style, they can be had with oil impregnated bronze bearing surface.
Or a PTFE liner instead.
The HEIM joint wipes the bearing surfaces clean when it moves.
If you use a non-stud type HEIM joint directly bolted with a bolt in the eye, then the movement will be restricted.
Use the stud style HEIM joint.
As inexpensive as they are, I would not use the greaseable type. Your just inviting dirt and grit to hang on the part that does not work well with such.
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