TABLETS

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3D Print RFinder P10 AMPS Pattern Microphone Clip
“For all the P10 users, I made a mount to hang the external mic using the AMPS pattern on the back. It is made thin so you can still use a car mount if you'd like. Because of the lip on the tablet, it doesn't lay perfectly flat across the back, but so far seems to flex that little bit just fine using PLA+.” Source: Ted Porter on RFinder Users Group (Facebook).
STI file: rfinder-p10-amps-pattern-microphone-clip.zip

P10 and Mounting Screws
Screw hole pattern on the back is AMPS.
Screws: Thread size = M4, Thread pitch = 0.7mm, Insert depth = 5mm
Here's one source for the screws: McMaster-Carr

P10 and SDR (software defined radio)

If the SDR apps can't find the RTL-SDR chip, set your USB to OTG. “Even though it is internal it is external to the android system, hence why you have to turn on the OTG to make it work.”
SDR Touch app via the Google Play Store along with the SDR Driver. The SDR Driver will auto-switch Android to OTG when you open SDR Touch.
RF Analyzer 1.13 is the app that's already installed on the P10

P 10 Antenna Ports
The left antenna is for the RTL-SDR receive only and the right one is for the radio itself.

Headset Adapter for P2 to Retevis Headset
Great info from Dave Krum.
Page: P2 Headset

P7 Tablet
Supercedes the P2.

P10 Tablet

P10 tablet flanked by B1's.

Mounting
The P10 under the hand strap has a standard AMPS 4 hole screw pattern. All of the RFinder tablets P10/P7/P2 have this 4 hole AMPS mount. You can use any mount that has that pattern.

RAM has several types on mount and ball size B is plenty large enough to hold the P10. Screws required for the tablets on the AMPS inserts are M4 x 0.70 x desired length (insert depth is 5mm). RAM ball B part RAM-347U will mount directly to the back of the P10/P7/P2 tablets with 12mm long screws with ram part listed above. Once you have ball B attached, any ball B arms/clamps and mounts can be used as needed to get the P10/P7/P2 where you want it.