I watched when the shop installed mine. They used emery cloth on the knuckle ball joint seat to clean off any corrosion. They had a home made press similar to the Mercedes tool and was very careful to turn the screw a few turns, then look to make sure that it is not going in crooked, hammer all around on the outside of the knuckle to relief any stress, turn a few more turns, look, hammer , look hammer till it is fully seated. You may or may not have to remove the ball joint boot depending on the tool you're using so that it's not damaged.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked