Door/window sensors

[danny]

How do I install the sensors on doors where
the door casing causes one magnet to be
recessed from the other magnet.

[iceblue]

Danny...you need to use spacers on the low
half of the magnetic contacts to bring them
flush.  Spacers can be made of any plastic
material like plexigas, etc.  I use double-
sided self sticking foam weatherstripping
(Frost King-white-3/8" wide 3/16" or 5/16"
thick.  My favorite, although black, is a
dense foam product called Grippers by
SoftTouch (found at Lowes).  It is single-
sided sticking, 1/4" thick and I cut with a
razor knife to the width of the magnetic
contacts.  You chose but level up those
contacts!