Last winter I slid into a fallen tree at about 2mph. No actual damage
but my nearside headlamp then pointed up into the trees. This is a
Volvo V70. I was able to remove the headlamp and spotted that a small
polythene ball had popped out of a slotted forked piece. I popped it
back and all was fine. While I was in there I 'clarted' everything
first in WD40 to clean it then Vaselene to protect it. So basically
what I'm saying is spray WD40 all over any exposed parts while hitting
the wing and/or activating the thumb switched that activate the
headlamp.

Chris.