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http://www.thingiverse.com/thing:480425
Handlebars GoPro Mount (20-50mm) by MatteoMeraldi is licensed under the Creative Commons - Attribution - Non-Commercial license.
http://creativecommons.org/licenses/by-nc/3.0/

# Summary

Handlebars GoPro Mount  
3 different dimentions:  
from 20mm to 30mm diamater  
from 30mm to 40mm diamater  
from 40mm to 50mm diamater  

Is designed to have the camera lens in the middle of the bar.  
Now your pictures will be perfectly symmetric.  

https://www.matteomeraldi.com/  

if you find my design usefull, please leave a tip!