Flex Unit Rubber Grips (too tight in outlet)

How to file down rubber grips on Flex Unit:
Please use a nail file or emery board and evenly file down the rubber grips.  Evenly swiping the file a couple times back and forth will get the grips to a proper fit for your specific vehicle. After a few rubs, reinsert into the outlet. Continue to file more off if the fit is still too tight. 

The Flex device should have a tight fit in the cigarette adapter for stability. This small adjustment will ensure a custom fit and will NOT void the warranty.