Lack of service is the only explanation for a balljoint coming apart. These things are checked at each yearly service when done professionally. When bad its a simple task to just push in another one: see page ten: http://www.klann-online.de/englisch/Produkte/Chapter_2.pdf

If you can't have a thief professionally service your car then it would be wise to find out what is expected for service done properly. It ain't just change the oil every 5k!

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician