I'm not sure how to reply from the digest mode of the server.  Hope this
makes it.  I just installed a sky light from Bus Depot and had no problems.
It's probably because I also installed a new gasket from Bus Depot at the
same time.  The first time I closed the cover I pressed it closed from the
outside of the van and left it in the closed position for several days.
This seemed to give it time to "seat with the seal.  I also installed a new
closing mechanism.  One of the nylon wheels on the closing mechanism came
cracked, but I had new wheels made from brass to solve future problems.  I
was so happy to find replacements that this little inconvenience wasn't a
problem.

George