Can you please tell me the required fastener size details for permanently installing the Shure MX392 boundary mic?
There are two "key hole" slots on the base of the mic. The slots are separated by 23 mm.
The length of the slot is 10 mm; the widest part has a diameter of 6 mm; the narrow part of the slot is 3 mm. Therefore, the head of the fastener must be smaller than 6 mm, but wider than 3 mm.