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Didn't you guys read team update #42? It specifically states that you need to install a Magnetic Field Alignment Device (MFAD) in order to keep the solenoid aligned with the magnetic field of the Earth. Basically, it is a device that will continually rotate the valve so that the Magnetic Field from the Earth doesn't interfere with the operation of the magnetic solenoid. See attached picture for one such device that I found. Note, however, that you must use the "H" variety of MFAD as the "G" variety is specifically outlawed by the part-use flowchart.
Also, according to team update #74, you no longer need to ship the MFADs with the robot.
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