I have a Phantom 3 standard was using my smart phone but wanted to use a larger tablet with the remote. The stock holder won't accommodate tablets so I added an Inspire holder. There are plenty of post/YouTube videos explaining how to install the Inspire tablet mount so I won't get into that. What I wanted to touch on was installing the Inspire holder so that it is rock solid. I went with the Inspire holder because it is made out of aluminum rather than plastic (Phantom advance/Pro) and is much sturdier. To summarize, most people just screw the large nut directly into the remotes plastic case, and this works pretty good. I wanted something a little more secure. So I threaded the support shaft and added a nut to secure the support arm. See the photos below for details.
Stock Inspire tablet holder and the parts needed for the mod.
The support shaft and parts removed, noticed the end of the shaft is smooth on one end.
I used an M5 die to put threads on the shaft.
Now I could thread an M5 nut onto the end of the shaft.
Inside the remote you have to remove some plastic to make room for the washer and nut. The area circled in Red needs to be removed.
Area now clear, wires push aside so they won't get damaged when I drill a hole in the remotes case.
After using the Inspire mount to locate the position for the hole (see YouTube videos on how to find the proper location) I started with a pilot hole (drill size 1/16) then finished it with a 7/32 drill.
I now used an M6 tap to put threads into the hole I just drilled.
Now you can thread the support nut into the case and install the lanyard screw.
With the support screwed in from the outside I added a washer and M5 nut to the inside to lock in the support shaft.
All done, super solid tablet holder.

Stock Inspire tablet holder and the parts needed for the mod.

The support shaft and parts removed, noticed the end of the shaft is smooth on one end.

I used an M5 die to put threads on the shaft.

Now I could thread an M5 nut onto the end of the shaft.

Inside the remote you have to remove some plastic to make room for the washer and nut. The area circled in Red needs to be removed.

Area now clear, wires push aside so they won't get damaged when I drill a hole in the remotes case.

After using the Inspire mount to locate the position for the hole (see YouTube videos on how to find the proper location) I started with a pilot hole (drill size 1/16) then finished it with a 7/32 drill.

I now used an M6 tap to put threads into the hole I just drilled.

Now you can thread the support nut into the case and install the lanyard screw.

With the support screwed in from the outside I added a washer and M5 nut to the inside to lock in the support shaft.

All done, super solid tablet holder.