My Bontrager rack let me remove one of the aluminum stabalizer stays and move the other to the middle attachment point. After that, it was easy to bend it up and secure it using the bolt at the top of my seat tube. I did have to file the end of the stay so that it fit without pushing against the seat post. It may not be the prettiest solution, but it works, the rack is stable, and secure. It might not work for your frame though.