Thank you for replying. I have no experience with these. I have been told that some of the black bears have a nice radiused shelf or a flat shelf that can be modded. I have also heard that removal of the limb locator tang with a dremel tool is needed, and that the limbs need shimmed on both sides with plastic pieces epoxied onto the riser pocket. The only other thing i have heard is to fill the voids in the pockets with JB Weld and then cover that with a piece of inner tube. Are these things so? Also that I will need 45 lb lumbs to make a 40 lb bow.