We bought a Pro_Form Treadmill from a friend. The running belt keeps moving off to the right side of machine and fraying the belt. Do not have a manual and do not know where to find the model number. Can anyone help me solve these problems? If so, e-mail me at phukill@tampabay.rr.com and I will get back with you. Or call me at 1-941-993-4013 . Thanking you in advance.