I’ve noticed when cutting sideways on a hill that the motor mounts allow enough flex that the stop brackets vibrate against the frame. With the tractor on a flat level surface there is only about 1/4 in before these stop brackets/ flanges would hit the frame anyway. I’ve read this is a common complaint. I’ve cut 3/8 fuel line vertically and used goop to hold it on the motor mount stopping flanges. This works for a while then the rubber wears out. Has anyone found a better way?