Suddenly the thread title makes sense again
I have two barrels in the shed too might have a play.
How did you get the cap back on out of interest? I fixed mine a while back and push the sides of the cap with a blunt braddle.
well thats the trikey bit balansing the door and spring wile pushing it back on
then wile someone hold it ar a g clamp tap the 4 lugs back in
if your careful to remove it leaving as little distortion as posible it makes it easier but in my experience you will never get it back quite as tight as fiat did but it holds on and works ok
you will find you can put he spring and pin back in 2 diferent ways
and one way will not fully close the door how ether putting it the correct way makes it almost impossible to hold it in place wile putting the lid back i find that if you pass a loop of strog thread up the lock from bottom and loop the lid you can hold it against the spring and put the lid on quickly then remove thread carefully