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Matthew,
Mine does a similar thing, but only 1/4 of a metric inch from either direction.
I suspect it as the reed switch activates under influence of the magnet, in your case 1 inch either side of the magnet.
Try moving the magnet a little higher on the ring (that is where mine is mounted) to increase the distance from the reed; Maybe an eighth or so at a time.
Mine is 15 imperial mm from the top of the switch to the bottom of the magnet housing.
Neil.
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