Dual Device - GoPro and Smartphone Configuration

Suggested configuration dual device setup:

GoPro (HERO8 Shown)

Smartphone/Pocket Radar (Google Pixel 3 XL)

LynkSpyder 
Source: LynkSpyder Store (Click Here) 

Smatree GoPro Tripod Mount
Source: LynkSpyder Store (Click Here) 

Bundled discount available as a bracket add-on

RetiCAM Tripod Mount 
Source: LynkSpyder Store (Click Here) 

Bundled discount available as a bracket add-on

SmallRig 11" Articulating Arm
Source: Amazon

This setup is a slight variation to the normal GoPro setup.  In this case, you would remove the thumb nut that is holding the GoPro to the Slyder bar.  In its place, tighten the barrel nut that comes with the SmallRig arm.  This allows the GoPro Tripod Mount to be tightened in place, and a threaded socket which to screw the articulating arm in place.  Then screw the RetiCAM Tripod Mount on the end of the articulating arm.  A smartphone or a PocketRadar can then be placed in the RetiCAM Tripod Mount.