Hi there to everybody on DIY NOT message to mods if there's already a discussion for the issue I have: I've moved properties in kirklees council area and got a old coal bunker as my outside storage shed and I tried some keys with one square notch cut on the key I'm wondering is my lock a 1 lever 2 lever or possibly a 3 lever mortice internal lock anyone ? I tried but unsuccessfully broke the key my dad had for his old coal bunker lock as I wasent sure if this key my dad gave me would open the levers on the lock mechanism here is a picture of my lock with the back plate unscrewed. Could anyone advise me on here which way the spring engages onto the levers as well as I'm quite sure it curls around one of the rivets in the lock casing but I'm not sure where the spring edges engage.