Long story short...had to replace limbs bc of stress fractures ( i used to shoot a TON!). I worked at a dealer and Martin sent me a set of replacements. Well instead of 55-70lb replacements, I got 65-80lb replacements. Back then they were 15lbs from min-max as opposed to 10 today? ANYWAY....I shoot 68lbs and with those limbs I get a lot of vibration and shock as opposed to my smooth shooting bow I had then. So out of the blue (today) I call Martin and tell them the story and they say if I ship the limbs back, they will send me a new set at no cost. I can/can't, for obvious reasons, wait for the end of season to get here so I can send my limbs back and get a new set and then put a new string on and havea new/old (2001) bow lol. 68lbs on my old limbs was almost all the way in and didnt vibrate at all. Im like a kid waiting on Christmas!