WARNING: The two new screws holes which this model is adding to the GPS mount might not be at the same location as the one on Garmin's mount. This is, to my knowledge, only compatible with https://www.printables.com/model/530905-gopro-mount-for-decathlon-gps-mount-adaptor.
I have a Decathlon GPS deported mount on my bike and wanted to attach my front light on it.
The top of the GPS mount is compatible with Garmin attachement but it doesn't have the two screws to attach anything underit. It only has a 5mm hole in the center. So first, we need to add an M4 insert into the “adaptor” and we can be secured it to the GPS mount using a M4 screw. The “adaptor” has two notches on the bottom in order to prevent the piece to rotate in the GPS mount.
It can receive two additional M3 or M4 inserts (Ruthex inserts have the same required hole dimension), which can be used to secure additional mounts.
The author marked this model as their own original creation.