Gear pin
B. A. at LHR have used long nose gear pins for years.
it is a long pole with a gear pin fixed to it, there is a keep type plate fixed to the other side which is able to rotate by means of a lanyard.
The lanyard is pulled down to uncover the pin which is then inserted in to the hole & the keep plate is then spring loaded back to the vertical position, this will prevent inadvertant removal.
At the bottom of the pole is a red streamer.
The pole is approx 6ft (2M) long.
Tristar 500