What do you hook to the 3pt bar that rotation is a problem? Seems keeping it from rotating, and then having a trailer or wagon tongue hooked to it (clevis with pin or ball hitch) would break something when the 3pt arms were raised.
Do you use it mostly to drop the 3pt arms down to get under a trailer tongue, and then lift it up? I can see that it would be frustrating if the bar rotated while doing this, making it necessary to get off the tractor (how we hate doing this) to straighten it out.
Good design.