Trapdoor Stuck Ball Fix
cut/bent piece of metal from sendcutsend g90 galvanized steel 0.030" thickness
3M 467MP is the adhesive Cliffy uses for those protectors
between adhesive and one of these Panel Clips, for 0.05" to 0.1" Panel Thickness | McMaster-Carr the attachment should be sturdy and removable
design a thin decal to get printed to disguise the extended flap - I'm thinking a lock that looks like the ones from the film