many years ago a friend traveling to a DC pen show had an agent YANK!! screw caps off vintage hard rubber pens. Resulting damage was several thousand dollars. When I traveled with vintage pens I would always explain they were vintage fountain pens, let me show you how they open.

If they complained I would ask for a supervisor, had to do that a few times but I was always calm and polite, with helped to keep them from getting nasty.