Yeah, $50. I priced one for my NH 404 hay crimper, not for safety, but because it was picking up the cuttings and wrapping them around the shaft. The safety shield can be anchored in place and prevented from turning.
But did you know that you are supposed to grease the interface where the locking nylon ring on the shaft meets the shield.
I am afraid of shafts and do not have anyone around when working. It only took a couple of cartoons of accidents that can happen to convince me that you do not come near a rotating shaft...........period!.....same thing in clearing a clog in a round baler. Shut the tractor off. Only takes a second and only takes a second for you to be in some other land.