Quote:
Originally Posted by id10t
There is a $20 kit with plastic templates and a couple of different hole saws to use on a drill.

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Careful- those big toothed 'hole saws' will skip and bounce and jump around and totally mess up the door with unpainted hardwood and metal facing.
I used the above Irwin template for the first time and the Shlage deadbolt did not work for some reason.
Everything looked like it lined up per the template but the thing did not work.
(vertical was way off, not backset, fwiw)
I've installed about 20 other locks successfully using patience and eyeballing it.
If the hole is totally screwed up, you can mortise in a flush plate and glue reinforcement wood into the missing space) but it will look very commercial ugly without a nice plate.