Garmin sandbag GPS mount to GoPro mount conversion

So I had one of these Garmin dash sand bag mounts for a 12 year old GPS that I never use and I decided to convert it to a GoPro mount. The Garmin units have a non skip rubber on the back and 4 pouches with some kind of weighted material that makes the mount excellent for non permanent mounts. Here in California it's illegal to mount anything directly to the windshield like the suction cup mounts.