Take a look in the kitchen area where the food cars are stowed....there is a 6 inch triangular aluminum latch that pivots down to retain the cart in place...
just a 3/16 Allen screw and that puppy comes off...
made for the job for pacifying a miscreant passenger...
just sayin...
Shhhh.
Lots of things I’ve notice on planes that could come in handy in a ... ahem ... situation.