The filter adapts well to the case of my gopro hero 3+. As against the first abduction, I separated the two sides enclosing the filter, luckily I was on top of a table so the filter does not fall high. There are two small holes on each side, I'll see if inserting a small room such key if it can not resolve the issue. If both pairs of holes are there, is that they must serve some purpose! I have not yet tested the filter under water.