During my time on 92sqn at Wildenrath I strapped many a nav into the rear seat. I think I recall 5 pins, these were stowed in front of the occupant just above the eyeline. On start up, before removal of the entry ladder, the last thing to bring to the nav's attention were the 5 stowed pins, Seat pan, guillotine, rocket pack, face screen, drogue gun. Once seated the nav would remove the lower pins, (rocket, pan, guillotine), I would then take out and stow the face screen and drogue once the nav was settled.
On return it was quite common for the crew to taxy in with canopies open and the lower pins fitted. Once shut down and unstrapped the nav would stand on the seat and fit the face screen and drogue. Before any service was carried out it was essential to ensure there were no pins in the stowage and they were correctly fitted before standing on the seat.
This was all 40 years ago so cut me some slack if I'm a little hazy!