> My thought on the skylight latch is that there might be a
> tendency to over tighten it when it leaks thus stressing out the
> skylight material (plexi glass ?) causing it to crack over time.

There is also a difference in the skylights themselves.  Ours (both single and dual pane) are made using the original Delta Six / Westfalia molds and meet OEM specs. The fit is more precise (so no leakage) and there is the correct amount of flex. The latter was actually a factory design criterion - rigid enough to seal properly, but flexible enough that if it got smacked when open it would absorb the impact rather than transferring it through the hinges to the fiberglass poptop itself.   

Ron Salmon
The Bus Depot, Inc.
www.busdepot.com