Very hard to give a helpful answer on that without being there.
Even could be try & feel if it was in front of me.
Hey I can only give a personal suggestion & I will not accept any responsibility for any problems you may have,
if you do this I advise that you take great care not to break anything.
I would make sure the outside door handle is pushed in all the way & then lock it again with the key
then unlock it all the way with the key.
When they have been deadlocked you have to turn the key round more than just the normal unlock position,
it is not a comfortable thing to turn them as far as required, they can be a very hard tight turn
but you also do not want to break anything so be very careful.
Good luck with it.![]()