grandpa tought me to pull his disc on the farm in 1968,with a farmall M he bought new, been doing it off and on since then, now i got a little ford 201 model i use behind the jubilee, [ know you guys pull ones that can use this thing as a replacement for just one disc] to break up the clay soil in my roping arena, i pull it straight, lift it out of the ground when i turn, but i cant seem to use it one time without breaking at least one of the disc at the center, it breaks the center where the spools are off the rest of the disc in one piece, and not nessessarily at the outside discs, the nuts are tight and the thing is in pretty good shape overall for being of unknown vintage, out here nobody has replacement discs with a 1" round hole