Ground Wires Connected Outside of Switch Box
I trrust and hope that the ground wires are indeed connected together out there, with a crimp ring or wire nut or clamp as opposed to merely being twisted together.
I would try to find some kind of small screw-tightened clamp that will fit on one of the other (bare) ground wires without nicking it and tie the ground wire of (or a bare pigtail to) the new device's ground.
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The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.
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