I may have a suggestion as I deal with stuck fasteners a good bit, however I do not understand your problem. Which of the following describes your problem?:
1) You have bolts that nearly come all the way out but the end, which you can see, is binding inside the nut. However, they can be turned back in.
2) The heads of the screws have stripped off and you cannot turn them any more
3) The bolts have stripped out the inside of the nut and spin without withdrawing
4) The bolt threads have stripped inside the nut and the bolts turns, but does not go in or out.
1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick