I cannot for the life of me figure out how to put on the six blade replacement cartridge on my sport ... the diagram picture shows that it's compatible, but I can't get it to go on. When I used to replace them with the normal three blade ones it took about five seconds, but for this one I just can't find the spot to clip it. I also can't find any videos of it on Youtube. Anybody have any advice?

Ya, But I put mine in a safe place where I wouldn't loose it. And as always I can't find it. My wife helps by ask where I left it and where did you see it last. Then she tell's me to call the cops, maybe someone broke in and stole it! There's no way to express how much this help means to me!

I would be really interested to hear from anyone how the sport performs with the 6 blade compared to the 3 blade. Presumably you could exert twice the pressure without getting cut assuming all blades are in contact with the skin. Is this perhaps why the ATX is said to be more forgiving?