GoPro adaptor for Garmin Dashboard Sandbag

I'm a recent GoPro buyer, but I had this old dashboard sandbag for a Garmin GPS sitting in my boneyard, seemed a shame to waste it. But it didn't accept the fitting for the GoPro.

I took measurements of the existing base and printed a replacement with the GoPro mount on top.

The only thing you need to add is the metric chrome nut cap on the left hand side. Those can be found at Home Depot, part # 649933 $0.72 for a pack of 2.