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I have had a similar problem and solved it by using a small piece of foam pipe insulation. I see no reason why a piece of sponge or similar material wouldn't work. I used two zip ties to hold the spacer in place, then positioned the sensor pick-up.


There are a few ways you can do the magnet sensing: Reed switch (a switch which physically closes with a magnetic field). If you swap the two wires, the sensor will work fine (i.e. it doesn't matter). You can test for this using the continuity tester mode of your multimeter (you'll have continuity if the magnet is near the sensor, and open circuit with ...

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