This is a simple adapter to allow a Runcam Thumb Pro to mount to the top of the GEPRC GEP-PX2.5 quadcopter frame. It has two screw mounts and a slot for a zip-tie to help secure it to the top plate.
It is untested.
FreeCAD source file is included (LinkDaily 2022.709)
The author hasn't provided the model origin yet.