And how is the paper kept flat then?
I don't know that RRB easel, but I guess even with the two blades flipped up two frame legs will still hold the paper and thus leave at least a small border to be cut off.
There a quite some different approaches to easel construction, that's why I ask.
I meant to get the quote "How do you get the paper to lay flat?"
The answer is to spray the easel with a re-placeable adhesive such as SprayMount. I have been using it for years.