Yes, my hinges were indeed from an ice cream bucket. My polypropylene has come from two scources, - one the ice cream containers and the other has been sheet code 5 plastic table mats I found in a shop. These were clearly labelled code 5 polypropylene and may be the better material. Nevertheless odd that my hinges stretched - inside the car was not overly hot, but those hinges sure stretched, giving not only excessive droop but a heck of a lot of upward movement too. If I had got flying it would have been OK in the air but on landing the vertical tail would have been knocked off, or worse!