I have located a Rears Pak-Flail that I am thinking about buying. It cuts 7'" , is a real heavy duty mower and appears to be in average condition. What bothers me is the plate with the serial number is missing. The seller says he thinks it just fell off. Another thing that bothers me is some of the cutters appear to need replacing. I have always been told to change all cutters and not just a few because it might make it out of balance and end up screwing up the bearings. Since I don't know that much about flail mowers I wanted to put it out there and get some opinion. The serial number issue bothers me the most, it could very well be stolen. The elderly gentleman that owns it says he bought it new about 12 years ago and might have some paperwork. He told me where he bought it so I called them. They have no record of selling it to him.