My westy rear view mirror has a big chuck of plastic missing from the back
side...now the plastic border that goes around the mirror has a split and I
can raise part of it off the mirror.  Will crazy glue work to make the border
tight around the mirror again?  If not, do I need to replace the whole rear
view mirror?  I wasn't sure where you even unsrew the mirror off...I suspect
buying the whole mirror is expensive and would rather fix inexpensively...any
advice?