In a message dated 96-02-03 15:43:44 EST, you write:

> I can't seem to find any adjustment or other means of tightening it
>down. Any ideas?

Mike,

I had this problem when I replaced my vent window on my 85 Westy.  I removed
the window and bent the upper attatchement down slightly.  This way, when I
reinstalled the window, the attaching screw on the top was slightly
missaligned and caused enough friction to prevent the window from pivoting.

-Gregg 
85 Westy, 76 Goldwing, 51 Plymouth, 75 Mercedes