I have a MF 1580 mounted on a MF1540 purchased new in 9/05. There are 40 hours on it and probably less then half those hours were running the BH. The detachable portion of the subframe is cracked on both the Left side and the Right side . Called the dealer and e-mailed him these pictures. He stated that this is the first generation sub-frame and that I should have recieved the newer sub-frame. He'll be coming out to pick it up and replace the cracked sub-frame with the newer model. Working with a good dealer does make life less stressful! Now to see if he can do the 50 hour check while it's at the shop even though I'm only at 40.4 hours.