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Changing a flip bolt mortice lock to a latch style mortice lock in aluminium door, looking at the instructions that come with the lock and the jig that's included. Using a jig we made it's much easier to see the lock footprint and speed up the process of converting one lock to the other. If you are interested in this Jig, please leave a comment. We will sell the Jig in our lock shop if locksmiths are interested. see www.drlock.com...