Hi John, the spring is from inside the latch assembly without one infront of me its difficult to describe but it holds one of the levers inside the latch up so that the other lever is allowed to move when the door is locked, to get at it you will have to remove the anti-theft guard and then remove the latch assembly, but with this spring off it puts extra strain on the lock (key) assembly and then the lock unit needs replacing, to find out when the guard is off disconnect the linkage from the key assy and see if will turn in both directions, I will have a look in my spares box and see if I can get a picture or a sketch of where the spring should go and I'll mail it to you contact me on nige110162@hotmail.co.uk
nigel
June 2008