[scrubjaysnest]

Latching the shells was not the problem with the lights in the vents. The problem was the lights were supported by a thin piece of plastic laying on the vent screen. This allowed the lights to hang down below the level of the crank handle for the tv antenna and thus rest on the back shell roof. As for latching the shells that is a matter of technique which took awhile to figure out. So both issues such as they were have been resolved.