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I looked at a few definitions of "solenoid" just now, and the common feature was ..., or moved a coil between permanent magnets.
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Sounds like a speaker to me.

But speakers would be prohibited under the no noise maker rule?
Read 2012 rule 48. If clutch is operated by a magnetic coil, you should be arguing that it is a solenoid otherwise you cannot use it unless it is powered by an allowed servo or motor.
While I generally do like stretching definitions, what GDC it trying to do is fairly clear. They trying to allow small magnetic actuators and at the same time keep the rules short.