Bought this to replace a very old security screen door lock (it replaces the Gainsborough/Austral HD7 or H9).
I wasn't sure if it would be a 1-to-1 replacement of the old lock, so I emailed The Lock Shop with my questions. They were quick to respond and helped me out. Amazing!
As someone who has never replaced a lock before, the user instructions that came with it were easy and straightforward enough.