I had a go at taking the lock barrels out of my cab door handles to play with the wafers and see if I could get the key working .Ive managed to pretty much sort it with removing one of the wafers as I didn't have spare sizes at hand .The problem I have is one of the handles had a spring that sat between the back of the barrel and was held in place with a screw and the lever spindle thing that turns side to side when you turn the key. No matter how I try and put the spring in it just sits lop sided and doesn't seem to be under load .do you need the spring as the other handle didn't have one ?