rain drops keep falling on my head

[Scott/Michelle <mcjsr@talstar.com>]

I have recently installed a new vinyl top on my B, and it has a nasty habit
of leaking from the seam just above the zip out rear window. I was wondering
if anyone has a fix for such a nasty problem? To be precise the seam would
be the one that the rear tension bar sits closest to when engaged.
TIA
Scott 
75 MGB