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What is the exact screw on the back of the Sennheiser G3 Receiver?

wondering what the exact screw head is on the back of the Sennheiser G3 to open up the transmitter or receiver.

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Back and antenna are Torx T9.

RF pcb are Torx T7.

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Andrew Miller crwdns2934231:0crwdne2934231:0
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