rendelharris Wrote: ------------------------------------------------------- > Have you got a spare (unused) key? Try that > first, often a key wears out before a lock, > especially if it's a copy. Good idea, but if I have a spare key I have no idea where it is! I doubt I have though, as I think the key was indeed a copy. My sister broke the original key one Christmas and Dulwich DIY managed to make a copy from half a key :) I think I will try WD40 and if that doesn't work I will replace the whole lock. I'm worried about security (if it sticks open) and safety (if it sticks closed).