Place a strong axle stand under the threaded part of the joint and jack the car up 6 inches above the axle stand. Undo the trolley jack so the car drops onto the joint quickly and the weight of the car together with the downward force is usually enough. Sometimes a second go is needed but this technique has never failed me.
I suggest a second set of axle stands slightly lower than the first one in case it slips of the first one.
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