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What I don't understand is how the ouside key operates the lever mechanism when it appears to be totally isolated from it.

Thanks for your replies, still a little confused!!

I have a standard Euro cylinder and lever handle on my front door which I would like to change to a more secure pad handle system. What does this entail as I am not sure how turning the key from the outside to enter affects the mechanism for the lever handle? Does it require a completely new...