Has anybody used old brake rotors. Just weld a smooth rod or a bolt with a smooth area on or tie the rope thru the hole the stud goes. The rotor sits flat on the bottom and holds very good. You can get used ones free at tire stores or auto repair shops size depends on the auto they come off of. Spray a little paint on them they work great. If you lose one, what have lost another trip to the repair shop or when you get your oil changed pick up another one they will be glad to get rid of them. Cub48