I had a Corbin dual seat installed on my bike when I picked it up new about a month ago, The back rest was installed behind the rider until yesterday. I had to take the seat off to get the screw out of the bottom of the back rest shaft in order to switch it to the back behind the passenger. If you leave this screw off, it makes it easy and quick to change the backrest from rider to the passenger backrest position. My question is: Do others use this backrest without the screw in. Is there any chance the backrest could come out while riding as it only is stuck in the seat a couple or 3 inches. Also, my biggest question of all: When the back rest is behind the passenger, they can just lean back and the backrest leans very far back with them and offer little back support like it does for the rider when installed in the front. I love the seat. It looks great but for the the big bucks I gave for this seat you would think it would offer more support for the passenger and be easier to change from front to back.