Got another question. I see that the unit can shift right and left. What I can not see is how the secondary shaft (going from PTO shaft out to chain drive) works. Does the secondary shaft expand and collapse just like the PTO shaft??
This one seems that the gearbox is fixed and the PTO shaft will move sideways. Over here in Portugal it's common to use like a female hex bushing inside the gearbox and then just a hex shaft going to the flail. This will allow for side movement without flexing the PTO shaft even more.