I put two Neodymium magnets on my swing arms just above the ball joint. I no longer have ANY metal shavings getting in the joint.
Here is the link to the magnets i got: http://www.homedepot.com/p/Crown-Bolt-3-4-in-Neodymium-Rare-Earth-Magnet-Discs-3-Pack-07047HD/202526369
They are POWERFULL
I have attached some pics of my setup. Hope it helps.