Erm. ?
I meant that one of the curved edges of the filter looks ragged. I am wondering if it is just some soft material along the edge there? Anyway, I ended up making a rash decisions and buying one here in Germany which cyra sent a link to. There is another interesting option in the States, but the import duties would make it more expensive. Thanks to everyone who sent links and information, this is really a great forum with great people!