An old JD conditioner is what taught me how to cuss. LOL We had an old worn out JD sickle mower and would put the conditioner behind it. Between the sickle plugging and the conditioner plugging you spent as much time off the tractor rather than on it. We bought our first mower conditioner in the mid n 1960s. I did not own a sickle bar mower for over thirty years because of that old junk sickle mower.
Still cuss even a "good" sickle bar mower. I only clip some road ditches that are too steep to mow out ways.
I am glad that technology has made better ways to mow hay.