Magnetic Phone holder to GoPro mount

This is an adapter to mount a magnetic phone case to any GoPro compatible mount. It uses a 1.5 inch by .250 (1/4th) inch magnet recessed into the mount. Circles of rubber are used for grip. One with 1.5-inch diameter sits directly on the magnet. One of 2-inch diameter covers entire face. The bottom hole is threaded with .250 x 20 standard tripod thread and will screw on without any insert.