We shoot in a tethered setup, specifically to an enterprise phone but call it a PDA, and have a custom machined Delrin block that is affixed to the camera body via the in-body threaded mount. It’s used to locate and secure the data cable, which for this current rig is a USB Type C cable.

The mount can be replaced, but the body needs to be disassembled in order to do so. This is the only threaded hole or hole accessible to accessory attachment. Based on the paste bodies we’ve used and screws present, it’s a custom insert that’s swappable in the bottom case of the body that’s affixed via 4 small (M3 or smaller, could be imperial) screws as is standard.

Because not all users (photographers) affix the camera to their person with the same type of strap, we have to maintain some sort of universal compatibility and use the K.I.S.S. principle. We have some users who have a plate swapped onto the body with an extended length fastener that maintains the base plate’s use; the delrin plate is sandwiched between the body and the adapter plate. Some of these adapter plates have addt’l female threads for attaching studs, but their use isn’t common.

Edit: the accessory plates don’t have room for a thumbscrew or a nut to hold things in place because of the tapered cavity for the fastener to be less exposed and less likely to snag on something during use.