on the back panel of some cars there are M8 bolts that hold the crash beam in. a couple of them go into the boot, what i want to know is if the crash beam is removed and the bolts put back in is there any possible way water can leak through them? my thoughts are that it's not possible but a dealer and a £700 bill say otherwise. surely water would have to defy gravity to wind through a thread and into the boot?! advice please!