First ND filters, fit seems loose, is this correct?

[Feek]

Hi,

I've bought some ND filters for my Mini 2, these are the first I've had and have just tried fitting them. The fitting feels quite loose, in that they're very easy to put on and take off. I just want to make sure this is correct and that I'm fitting them properly. There doesn't seem to be any other way for them to go on, I was just sort of expecting a more positive fit, perhaps even a little click as they slotted into place.

Thanks.

 

[Feek]

Answering myself. I found this so it seems correct.

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