UPDATED Version 2: Made a modest change to the quarter turn mount to reinforce a little. Depending on the material used, the "wings" can be a little brittle, so added a cross tie to shore those up a little more. Haven't fully tested yet, but should make a difference.

Stem mount designed to work with Garmin 510/520/810/820/1000. Over-engineered to be rugged enough for use with my mountain bike.