P E H,
On a part for a car that is as critical as a front hub, especially on a heavier one as a 560SEC, a new or used hub should replace the damaged one. Don't even think of a helicoil etc when four of the five are bad. Life is too valuable to risk on a few dollars for a hub, true? OK to fix on trunk hinges, door hinge, center console etc but NOT a front hub.