Hello, I realise it's rare to see a post asking about putting on filters rather than taking them off on the phantom 3, but I have just purchased an Orsda variable ND and after removing the UV filter it doesn't seem to go on. I don't want to push it too hard and break the thread on the phantom but I was wandering if any others have had this problem or if there is something I'm missing? It may just be a faulty filter but is there anything else I need to take off the lens to fit it on? Perhaps some rubber around the edge (I don't want to pull anything off before I know). Thank you!