Here is my problem!! I keep my double extension ladder in the garden by the side of the house and use a bicycle "D" lock to secure it to my down pipe for safety. I needed to use the ladder but hadn't unlocked it for a year or so, obviously the rain and damp have done their best to freeze the lock. I have been patient and over a period of a week or so have spent every evening with wd40 and jiggling the key for 10 mins at a time trying to work it loose, but no good it is solid. As I needed to use the ladder I took my downpipe off the wall and got the ladder free, but I cannot extend it because the D lock obviously holds both sections together. I have accepted that I will have to wreck the lock somehow but obviously they are made thief proof. The metal itself is about 7 or 8mm dia and I have tried a metal jigsaw blade but it hasn't even touched it. Anybody got any ideas?