We just purchased a Pfaff 145 with a walking foot. We cannot get the machine in time. If we get it to pick up the bobbin, then the thread becomes a big tangled mess. If it doesnt pick it up, the needle is hitting the bobbin. We need an instruction video on how to time the machine, adjust the tension on the walking foot, how to assemble the entire bobbin mechanism. Can anyone help us. We just paid alot for machine and cannot afford to take to a person to fix it. Frustrated in Michigan!