Some background: up to now I've used the garmin mounts for my current 76-series unit, and for my older Etrex, and only had endless problems with them. vibration is a big problem with all the Garmin mounts, especially with the larger GPS units like the 76's. the GPS mount vibrates constantly making an annoying rattling sound which is very distracting. on top of that the GPS has varying sensitivity to shock, with the etrex it would constantly shut off when i hit bumps, the 76 is a bit better although i still had to hack it to make it totally shock-proof. and of course, the 76 mount ultimately just snapped when i hit a big bump.
This project is brought to you by MonkeyLectric and the Monkey Light bike light
Step 1: Tie on the Innertube
Step 2: Tie on the Gps
the 2" thick sponge takes up all the un-evenness of the stem/headtube/handlebar