GoPro Filter Mount

I design this simple GoPro filter mount in order to use 30mm filter (Polarized, Neutral Density, ...) without having something too heavy.
You can use this filter mount with GoPro 3 and 4 (no tested with other version of GoPro).
For exemple if you want to remove the jello effect, you can use a ND8 filter.
The total weight of a polarized filter and this mount is only 4g