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Well here is an idea that I plan to use on a mini monster truck with links it is very simple and should work nicely(although I havn't tried it yet).
Use a very small rubber grommet I have found some at hobby shops that will just fit a 4/40 bolt through, you have to figure out your spacing for the holes in the links then drill them to fit snugly over the grommet then just use a 4/40 bolt and bolt it to the chassis the grommet should give enough to act as a ball joint but not be sloppy.
Like I said I havn't tried it yet but when I do I think I'll sleeve the inside hole of the grommet with two brass tubes(to ack as bearings), with the one on the inside around the bolt slightly longer so the one inside of the grommet can rotate easy and I'd throw a couples of thin washers on also.
It's just an idea it may or may not work it's just the simplest way I could think of doing a small functioning ball joint.It may not need any more than the link,grommet and bolt.
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