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For a double solenoid, it is best to just pulse 1 side or the other. It is ok, but not the best to hold one side or the other. If neither side get power, it keeps its position. If both sides get power, bad things happen.
The single solenoid needs power to stay extended. if no power is applied, it retracts. You can do some really neat stuff with this, when you realize that it doesn't receive power when the robot is disabled (like after the match), so you can use it to trigger something right as the match ends.
Hope that helps
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