mount your Garmin eTrex GPS on any existing quarter turn mount meant for Garmin edge or similar.
If you have a Wahoo please see my Etrex to Wahoo mount
Compatable with the following Garmin GPS units:
eTrex (excluding older eTrex h models with different mounting style)
Please note. I have found that there is dimensional variance between different GPS units causing some to fit very tight in the mount. If you experience an extra snug fit some light sanding may be required to dial in the fit.