Mowing with an older Mott flail mower on a John Deere 2020

I bought this Mott flail mower (also called Mott Hammer Knife) used for $250. I rebuilt the gearbox, installed new blades (180 of them), and painted it. I probably put another $250 into it for the parts. It is 74" wide and weighs about 1200 lbs according to the manual. It is a finish mower but it is very heavy duty and I have used it for mowing 4ft tall weeds and thistle which it cuts down easily. I would not use it for mowing woody brush like small trees because the blades are not heavy enough. It's a neat mower and does not throw rocks like my 7ft rotary cutters does. I like how it does not hang way out from the tractor which makes it nice for turning and not worrying about hitting anything. It is smooth running and I have not had any issues with it for a few years now. I mow with it 4 times a year or so. Powering the mower is my 1966 John Deere 2020. It is about 50hp and does not have any trouble with this mower.