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This is a cheap tool you can make from the hardware store for splitting ball joints. All you need is a Rod Coupling Nut and a bolt. The Rod Coupling Nut is long and helps span the distance between the ball joints.
You can also improvise a similar tool using two bolts and a regular nut, you just need to get a couple of bolts that will span the distance between the ball joints while bottomed out on together in the nut.