Ericfowkes: My original hood design had a counter weight, that's what the bottom tab was for. I has a piece that went around the back from the bottom so you could still use the factory brace for travel without having to remove it like you do with anything on the top. With extensive testing I found that the counter weight wasn't needed so I saved the weight. I do have a new version that clamps on opposed to sliding on that is lighter that I am about to start selling on ebay. Anyone who has already bought one of my mounts that would like to beta test the new version, pm me and I will send you one for free. For me, having something that can remain on even during travel is crucial, I have left so many things in the field over the years, I don't want to think about it.