I got on the classifieds here, and a fellow presented an opportunity to swap limbs on his Martin Cheetah. He has an 08 with 70# limbs and I have an 09 Cheetah with 60# limbs. I went to the tech manuals online to see what limb he has on his bow, but there is no limb info for the 08 model. Looking at the two bows, there is a difference where the limbs articulate with the riser: the 09 has a rotocup and the 08 does not have this. So, I wonder if the limbs are really interchangeable or not?