I used WAX bike chain lube on the ball link end letting it dry. Then using Urethane size 008 o-rings, placed one on each side of link ball & added a slightly larger SS washer.
There a perfect fit that just touches the ball & link end making a seal that still rotates freely. With the just touching fit of o-ring the slop of the ball within the end link is eliminated, dirt stays out and rear camber stays more accurate over the long haul and no rattles from the links !!
On the wheel side they use a different ball within link end & used a couple small metric o-rings 1.5x5 size.
* This should work on all the 1/8 scale ARRMA's and likely many others.
Looks like this ...
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