iPhone Garmin Mount

Added a platform to the Garmin quarter turn mount to hold my iPhone7 in a case while using my bike indoors on a trainer.

Update: Added files for an insert to the mount which will hold my phone horizontally (to watch videos while riding). Due to the size of my printer, I've cut the model in half in order to print it in the optimal orientation and glue the two halves together later. There is a void inside this part, so infill is less important.